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How to make a list of partial sums using forEach



The Next CEO of Stack OverflowCreating an array of cumulative sum in javascriptHow do JavaScript closures work?How do I check if an element is hidden in jQuery?jQuery get specific option tag textHow do I check if an array includes an object in JavaScript?How do I redirect to another webpage?How do I make the first letter of a string uppercase in JavaScript?How to check whether a string contains a substring in JavaScript?How do I remove a particular element from an array in JavaScript?Remove duplicate values from JS arrayHow does PHP 'foreach' actually work?










21















I have an array of arrays which looks like this:



changes = [ [1, 1, 1, -1], [1, -1, -1], [1, 1] ];


I want to get the next value in the array by adding the last value



values = [ [1, 2, 3, 2], [1, 0, -1], [1, 2] ];


so far I have tried to use a forEach:



changes.forEach(change => 
let i = changes.indexOf(change);
let newValue = change[i] + change[i + 1]
);


I think I am on the right lines but I cannot get this approach to work, or maybe there is a better way to do it.










share|improve this question



















  • 1





    Please elaborate this "I want to be able to increment the values based on the next value in the array to get this result:"

    – Syed Mehtab Hassan
    Mar 20 at 10:51






  • 1





    This is just a cumulative sum wrapped in .map. The answer by Thomas is better than anything you'll find there though.

    – JollyJoker
    Mar 20 at 12:21






  • 2





    @JollyJoker Thomas simulate .reduce method, why not use .reduce directly ?

    – R3tep
    Mar 20 at 12:26






  • 1





    @Thomas Look my answer, you can use an array as accumulator.

    – R3tep
    Mar 20 at 12:52






  • 1





    Never use forEach if you want to produce a result.

    – Bergi
    Mar 20 at 13:55















21















I have an array of arrays which looks like this:



changes = [ [1, 1, 1, -1], [1, -1, -1], [1, 1] ];


I want to get the next value in the array by adding the last value



values = [ [1, 2, 3, 2], [1, 0, -1], [1, 2] ];


so far I have tried to use a forEach:



changes.forEach(change => 
let i = changes.indexOf(change);
let newValue = change[i] + change[i + 1]
);


I think I am on the right lines but I cannot get this approach to work, or maybe there is a better way to do it.










share|improve this question



















  • 1





    Please elaborate this "I want to be able to increment the values based on the next value in the array to get this result:"

    – Syed Mehtab Hassan
    Mar 20 at 10:51






  • 1





    This is just a cumulative sum wrapped in .map. The answer by Thomas is better than anything you'll find there though.

    – JollyJoker
    Mar 20 at 12:21






  • 2





    @JollyJoker Thomas simulate .reduce method, why not use .reduce directly ?

    – R3tep
    Mar 20 at 12:26






  • 1





    @Thomas Look my answer, you can use an array as accumulator.

    – R3tep
    Mar 20 at 12:52






  • 1





    Never use forEach if you want to produce a result.

    – Bergi
    Mar 20 at 13:55













21












21








21


2






I have an array of arrays which looks like this:



changes = [ [1, 1, 1, -1], [1, -1, -1], [1, 1] ];


I want to get the next value in the array by adding the last value



values = [ [1, 2, 3, 2], [1, 0, -1], [1, 2] ];


so far I have tried to use a forEach:



changes.forEach(change => 
let i = changes.indexOf(change);
let newValue = change[i] + change[i + 1]
);


I think I am on the right lines but I cannot get this approach to work, or maybe there is a better way to do it.










share|improve this question
















I have an array of arrays which looks like this:



changes = [ [1, 1, 1, -1], [1, -1, -1], [1, 1] ];


I want to get the next value in the array by adding the last value



values = [ [1, 2, 3, 2], [1, 0, -1], [1, 2] ];


so far I have tried to use a forEach:



changes.forEach(change => 
let i = changes.indexOf(change);
let newValue = change[i] + change[i + 1]
);


I think I am on the right lines but I cannot get this approach to work, or maybe there is a better way to do it.







javascript arrays ecmascript-6 foreach






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Mar 20 at 14:51









Solomon Ucko

7902822




7902822










asked Mar 20 at 10:47









Team CafeTeam Cafe

1215




1215







  • 1





    Please elaborate this "I want to be able to increment the values based on the next value in the array to get this result:"

    – Syed Mehtab Hassan
    Mar 20 at 10:51






  • 1





    This is just a cumulative sum wrapped in .map. The answer by Thomas is better than anything you'll find there though.

    – JollyJoker
    Mar 20 at 12:21






  • 2





    @JollyJoker Thomas simulate .reduce method, why not use .reduce directly ?

    – R3tep
    Mar 20 at 12:26






  • 1





    @Thomas Look my answer, you can use an array as accumulator.

    – R3tep
    Mar 20 at 12:52






  • 1





    Never use forEach if you want to produce a result.

    – Bergi
    Mar 20 at 13:55












  • 1





    Please elaborate this "I want to be able to increment the values based on the next value in the array to get this result:"

    – Syed Mehtab Hassan
    Mar 20 at 10:51






  • 1





    This is just a cumulative sum wrapped in .map. The answer by Thomas is better than anything you'll find there though.

    – JollyJoker
    Mar 20 at 12:21






  • 2





    @JollyJoker Thomas simulate .reduce method, why not use .reduce directly ?

    – R3tep
    Mar 20 at 12:26






  • 1





    @Thomas Look my answer, you can use an array as accumulator.

    – R3tep
    Mar 20 at 12:52






  • 1





    Never use forEach if you want to produce a result.

    – Bergi
    Mar 20 at 13:55







1




1





Please elaborate this "I want to be able to increment the values based on the next value in the array to get this result:"

– Syed Mehtab Hassan
Mar 20 at 10:51





Please elaborate this "I want to be able to increment the values based on the next value in the array to get this result:"

– Syed Mehtab Hassan
Mar 20 at 10:51




1




1





This is just a cumulative sum wrapped in .map. The answer by Thomas is better than anything you'll find there though.

– JollyJoker
Mar 20 at 12:21





This is just a cumulative sum wrapped in .map. The answer by Thomas is better than anything you'll find there though.

– JollyJoker
Mar 20 at 12:21




2




2





@JollyJoker Thomas simulate .reduce method, why not use .reduce directly ?

– R3tep
Mar 20 at 12:26





@JollyJoker Thomas simulate .reduce method, why not use .reduce directly ?

– R3tep
Mar 20 at 12:26




1




1





@Thomas Look my answer, you can use an array as accumulator.

– R3tep
Mar 20 at 12:52





@Thomas Look my answer, you can use an array as accumulator.

– R3tep
Mar 20 at 12:52




1




1





Never use forEach if you want to produce a result.

– Bergi
Mar 20 at 13:55





Never use forEach if you want to produce a result.

– Bergi
Mar 20 at 13:55












7 Answers
7






active

oldest

votes


















22














You could save a sum and add the values.






var array = [[1, 1, 1, -1], [1, -1, -1], [1, 1]],
result = array.map(a => a.map((s => v => s += v)(0)));

console.log(result);





By using forEach, you need to take the object reference and the previous value or zero.






var array = [[1, 1, 1, -1], [1, -1, -1], [1, 1]];

array.forEach(a => a.forEach((v, i, a) => a[i] = (a[i - 1] || 0) + v));

console.log(array);








share|improve this answer


















  • 1





    That first approach looks nice, but is really inefficient.

    – T.J. Crowder
    Mar 20 at 10:58






  • 12





    but man does it look nice

    – Jeremy Thille
    Mar 20 at 10:58






  • 1





    @T.J.Crowder could you explain or point me in the right direction, why the first approach is inefficient?

    – Thomas
    Mar 20 at 11:01






  • 1





    @Thomas - Look at all the functions it's creating and executing. Your solution is great -- as concise (way more so than mine) and still efficient.

    – T.J. Crowder
    Mar 20 at 11:01







  • 2





    really, for three items in the outer array? if you really want to speed up the execution, you never use some array methods, instead use nested for loops and create new arrays.

    – Nina Scholz
    Mar 20 at 11:05



















13














A version with map.






const changes = [
[1, 1, 1, -1],
[1, -1, -1],
[1, 1]
];

const values = changes.map(array =>
let acc = 0;
return array.map(v => acc += v);
);

console.log(values);

.as-console-wrappertop:0;max-height:100%!important





And this doesn't change the source Array.






share|improve this answer

























  • Note that the array of arrays structure is just a needless complication. The question is actually about the cumulative sum of an array. I'd split out the outer mapping function into something called cumulativeSum

    – JollyJoker
    Mar 20 at 12:25


















4














New ESNext features of generators are nice for this.



Here I've created a simple sumpUp generator that you can re-use.






function* sumUp(a) 
let sum = 0;
for (const v of a) yield sum += v;


const changes = [ [1, 1, 1, -1], [1, -1, -1], [1, 1] ];
const values = changes.map(a => [...sumUp(a)]);

console.log(values);








share|improve this answer
































    3

















    const changes = [ [1, 1, 1, -1], [1, -1, -1], [1, 1] ]
    let values = []
    changes.forEach(arr =>
    let accu = 0
    let nestedArr = []
    arr.forEach(n =>
    accu += n
    nestedArr.push(accu)
    )
    values.push(nestedArr)
    )
    console.log(values)








    share|improve this answer






























      3














      You may use map function of Array




      const changes = [ [1, 1, 1, -1], [1, -1, -1], [1, 1] ]; 
      const result = changes.map((v) => v.slice(0).map((t, i, arr) => i === 0 ? t : (arr[i] += arr[i - 1])))
      console.log(changes);
      console.log(result);





      Update



      Use slice to clone array. This will prevent changes to the original array.






      share|improve this answer




















      • 3





        This modifies the source array, which is probably not a good idea.

        – T.J. Crowder
        Mar 20 at 10:56











      • Yes. And slice will help to prevent that. Thanks for the tip

        – Alexander
        Mar 20 at 11:02


















      2














      Here is an easier to read way that iterates over the outer list of arrays. A copy of the inner array is made to keep the initial values (like [1, 1, 1, -1]). It then iterates over each value in the copied array and adds it to each index after it in the original array.






      var changes = [[1, 1, 1, -1], [1, -1, -1], [1, 1]];
      changes.forEach(subArray =>
      var subArrayCopy = subArray.slice(); // Create a copy of the current sub array (i.e. subArrayCopy = [1, 1, 1, -1];)
      subArrayCopy.forEach((val, index) => // Iterate through each value in the copy
      for (var i = subArray.length - 1; i > index; i--) // For each element from the end to the current index
      subArray[i] += val; // Add the copy's current index value to the original array

      );
      )
      console.log(changes);








      share|improve this answer






























        2














        Another way,



        You can use .map to return your new array with the desired results. By using .reduce with an array as an accumulator, you can generate the subarray.






        var array = [[1, 1, 1, -1], [1, -1, -1], [1, 1]],
        result = array.map(a => a.reduce((ac, v, i) => , []));

        console.log(result);

        // shorter
        result = array.map(a => a.reduce((ac, v, i) => [...ac, (ac[i-1] || 0) + v], []));
        console.log(result);








        share|improve this answer

























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          7 Answers
          7






          active

          oldest

          votes








          7 Answers
          7






          active

          oldest

          votes









          active

          oldest

          votes






          active

          oldest

          votes









          22














          You could save a sum and add the values.






          var array = [[1, 1, 1, -1], [1, -1, -1], [1, 1]],
          result = array.map(a => a.map((s => v => s += v)(0)));

          console.log(result);





          By using forEach, you need to take the object reference and the previous value or zero.






          var array = [[1, 1, 1, -1], [1, -1, -1], [1, 1]];

          array.forEach(a => a.forEach((v, i, a) => a[i] = (a[i - 1] || 0) + v));

          console.log(array);








          share|improve this answer


















          • 1





            That first approach looks nice, but is really inefficient.

            – T.J. Crowder
            Mar 20 at 10:58






          • 12





            but man does it look nice

            – Jeremy Thille
            Mar 20 at 10:58






          • 1





            @T.J.Crowder could you explain or point me in the right direction, why the first approach is inefficient?

            – Thomas
            Mar 20 at 11:01






          • 1





            @Thomas - Look at all the functions it's creating and executing. Your solution is great -- as concise (way more so than mine) and still efficient.

            – T.J. Crowder
            Mar 20 at 11:01







          • 2





            really, for three items in the outer array? if you really want to speed up the execution, you never use some array methods, instead use nested for loops and create new arrays.

            – Nina Scholz
            Mar 20 at 11:05
















          22














          You could save a sum and add the values.






          var array = [[1, 1, 1, -1], [1, -1, -1], [1, 1]],
          result = array.map(a => a.map((s => v => s += v)(0)));

          console.log(result);





          By using forEach, you need to take the object reference and the previous value or zero.






          var array = [[1, 1, 1, -1], [1, -1, -1], [1, 1]];

          array.forEach(a => a.forEach((v, i, a) => a[i] = (a[i - 1] || 0) + v));

          console.log(array);








          share|improve this answer


















          • 1





            That first approach looks nice, but is really inefficient.

            – T.J. Crowder
            Mar 20 at 10:58






          • 12





            but man does it look nice

            – Jeremy Thille
            Mar 20 at 10:58






          • 1





            @T.J.Crowder could you explain or point me in the right direction, why the first approach is inefficient?

            – Thomas
            Mar 20 at 11:01






          • 1





            @Thomas - Look at all the functions it's creating and executing. Your solution is great -- as concise (way more so than mine) and still efficient.

            – T.J. Crowder
            Mar 20 at 11:01







          • 2





            really, for three items in the outer array? if you really want to speed up the execution, you never use some array methods, instead use nested for loops and create new arrays.

            – Nina Scholz
            Mar 20 at 11:05














          22












          22








          22







          You could save a sum and add the values.






          var array = [[1, 1, 1, -1], [1, -1, -1], [1, 1]],
          result = array.map(a => a.map((s => v => s += v)(0)));

          console.log(result);





          By using forEach, you need to take the object reference and the previous value or zero.






          var array = [[1, 1, 1, -1], [1, -1, -1], [1, 1]];

          array.forEach(a => a.forEach((v, i, a) => a[i] = (a[i - 1] || 0) + v));

          console.log(array);








          share|improve this answer













          You could save a sum and add the values.






          var array = [[1, 1, 1, -1], [1, -1, -1], [1, 1]],
          result = array.map(a => a.map((s => v => s += v)(0)));

          console.log(result);





          By using forEach, you need to take the object reference and the previous value or zero.






          var array = [[1, 1, 1, -1], [1, -1, -1], [1, 1]];

          array.forEach(a => a.forEach((v, i, a) => a[i] = (a[i - 1] || 0) + v));

          console.log(array);








          var array = [[1, 1, 1, -1], [1, -1, -1], [1, 1]],
          result = array.map(a => a.map((s => v => s += v)(0)));

          console.log(result);





          var array = [[1, 1, 1, -1], [1, -1, -1], [1, 1]],
          result = array.map(a => a.map((s => v => s += v)(0)));

          console.log(result);





          var array = [[1, 1, 1, -1], [1, -1, -1], [1, 1]];

          array.forEach(a => a.forEach((v, i, a) => a[i] = (a[i - 1] || 0) + v));

          console.log(array);





          var array = [[1, 1, 1, -1], [1, -1, -1], [1, 1]];

          array.forEach(a => a.forEach((v, i, a) => a[i] = (a[i - 1] || 0) + v));

          console.log(array);






          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered Mar 20 at 10:54









          Nina ScholzNina Scholz

          195k15107178




          195k15107178







          • 1





            That first approach looks nice, but is really inefficient.

            – T.J. Crowder
            Mar 20 at 10:58






          • 12





            but man does it look nice

            – Jeremy Thille
            Mar 20 at 10:58






          • 1





            @T.J.Crowder could you explain or point me in the right direction, why the first approach is inefficient?

            – Thomas
            Mar 20 at 11:01






          • 1





            @Thomas - Look at all the functions it's creating and executing. Your solution is great -- as concise (way more so than mine) and still efficient.

            – T.J. Crowder
            Mar 20 at 11:01







          • 2





            really, for three items in the outer array? if you really want to speed up the execution, you never use some array methods, instead use nested for loops and create new arrays.

            – Nina Scholz
            Mar 20 at 11:05













          • 1





            That first approach looks nice, but is really inefficient.

            – T.J. Crowder
            Mar 20 at 10:58






          • 12





            but man does it look nice

            – Jeremy Thille
            Mar 20 at 10:58






          • 1





            @T.J.Crowder could you explain or point me in the right direction, why the first approach is inefficient?

            – Thomas
            Mar 20 at 11:01






          • 1





            @Thomas - Look at all the functions it's creating and executing. Your solution is great -- as concise (way more so than mine) and still efficient.

            – T.J. Crowder
            Mar 20 at 11:01







          • 2





            really, for three items in the outer array? if you really want to speed up the execution, you never use some array methods, instead use nested for loops and create new arrays.

            – Nina Scholz
            Mar 20 at 11:05








          1




          1





          That first approach looks nice, but is really inefficient.

          – T.J. Crowder
          Mar 20 at 10:58





          That first approach looks nice, but is really inefficient.

          – T.J. Crowder
          Mar 20 at 10:58




          12




          12





          but man does it look nice

          – Jeremy Thille
          Mar 20 at 10:58





          but man does it look nice

          – Jeremy Thille
          Mar 20 at 10:58




          1




          1





          @T.J.Crowder could you explain or point me in the right direction, why the first approach is inefficient?

          – Thomas
          Mar 20 at 11:01





          @T.J.Crowder could you explain or point me in the right direction, why the first approach is inefficient?

          – Thomas
          Mar 20 at 11:01




          1




          1





          @Thomas - Look at all the functions it's creating and executing. Your solution is great -- as concise (way more so than mine) and still efficient.

          – T.J. Crowder
          Mar 20 at 11:01






          @Thomas - Look at all the functions it's creating and executing. Your solution is great -- as concise (way more so than mine) and still efficient.

          – T.J. Crowder
          Mar 20 at 11:01





          2




          2





          really, for three items in the outer array? if you really want to speed up the execution, you never use some array methods, instead use nested for loops and create new arrays.

          – Nina Scholz
          Mar 20 at 11:05






          really, for three items in the outer array? if you really want to speed up the execution, you never use some array methods, instead use nested for loops and create new arrays.

          – Nina Scholz
          Mar 20 at 11:05














          13














          A version with map.






          const changes = [
          [1, 1, 1, -1],
          [1, -1, -1],
          [1, 1]
          ];

          const values = changes.map(array =>
          let acc = 0;
          return array.map(v => acc += v);
          );

          console.log(values);

          .as-console-wrappertop:0;max-height:100%!important





          And this doesn't change the source Array.






          share|improve this answer

























          • Note that the array of arrays structure is just a needless complication. The question is actually about the cumulative sum of an array. I'd split out the outer mapping function into something called cumulativeSum

            – JollyJoker
            Mar 20 at 12:25















          13














          A version with map.






          const changes = [
          [1, 1, 1, -1],
          [1, -1, -1],
          [1, 1]
          ];

          const values = changes.map(array =>
          let acc = 0;
          return array.map(v => acc += v);
          );

          console.log(values);

          .as-console-wrappertop:0;max-height:100%!important





          And this doesn't change the source Array.






          share|improve this answer

























          • Note that the array of arrays structure is just a needless complication. The question is actually about the cumulative sum of an array. I'd split out the outer mapping function into something called cumulativeSum

            – JollyJoker
            Mar 20 at 12:25













          13












          13








          13







          A version with map.






          const changes = [
          [1, 1, 1, -1],
          [1, -1, -1],
          [1, 1]
          ];

          const values = changes.map(array =>
          let acc = 0;
          return array.map(v => acc += v);
          );

          console.log(values);

          .as-console-wrappertop:0;max-height:100%!important





          And this doesn't change the source Array.






          share|improve this answer















          A version with map.






          const changes = [
          [1, 1, 1, -1],
          [1, -1, -1],
          [1, 1]
          ];

          const values = changes.map(array =>
          let acc = 0;
          return array.map(v => acc += v);
          );

          console.log(values);

          .as-console-wrappertop:0;max-height:100%!important





          And this doesn't change the source Array.






          const changes = [
          [1, 1, 1, -1],
          [1, -1, -1],
          [1, 1]
          ];

          const values = changes.map(array =>
          let acc = 0;
          return array.map(v => acc += v);
          );

          console.log(values);

          .as-console-wrappertop:0;max-height:100%!important





          const changes = [
          [1, 1, 1, -1],
          [1, -1, -1],
          [1, 1]
          ];

          const values = changes.map(array =>
          let acc = 0;
          return array.map(v => acc += v);
          );

          console.log(values);

          .as-console-wrappertop:0;max-height:100%!important






          share|improve this answer














          share|improve this answer



          share|improve this answer








          edited Mar 20 at 11:01









          T.J. Crowder

          697k12312401336




          697k12312401336










          answered Mar 20 at 10:59









          ThomasThomas

          5,2161510




          5,2161510












          • Note that the array of arrays structure is just a needless complication. The question is actually about the cumulative sum of an array. I'd split out the outer mapping function into something called cumulativeSum

            – JollyJoker
            Mar 20 at 12:25

















          • Note that the array of arrays structure is just a needless complication. The question is actually about the cumulative sum of an array. I'd split out the outer mapping function into something called cumulativeSum

            – JollyJoker
            Mar 20 at 12:25
















          Note that the array of arrays structure is just a needless complication. The question is actually about the cumulative sum of an array. I'd split out the outer mapping function into something called cumulativeSum

          – JollyJoker
          Mar 20 at 12:25





          Note that the array of arrays structure is just a needless complication. The question is actually about the cumulative sum of an array. I'd split out the outer mapping function into something called cumulativeSum

          – JollyJoker
          Mar 20 at 12:25











          4














          New ESNext features of generators are nice for this.



          Here I've created a simple sumpUp generator that you can re-use.






          function* sumUp(a) 
          let sum = 0;
          for (const v of a) yield sum += v;


          const changes = [ [1, 1, 1, -1], [1, -1, -1], [1, 1] ];
          const values = changes.map(a => [...sumUp(a)]);

          console.log(values);








          share|improve this answer





























            4














            New ESNext features of generators are nice for this.



            Here I've created a simple sumpUp generator that you can re-use.






            function* sumUp(a) 
            let sum = 0;
            for (const v of a) yield sum += v;


            const changes = [ [1, 1, 1, -1], [1, -1, -1], [1, 1] ];
            const values = changes.map(a => [...sumUp(a)]);

            console.log(values);








            share|improve this answer



























              4












              4








              4







              New ESNext features of generators are nice for this.



              Here I've created a simple sumpUp generator that you can re-use.






              function* sumUp(a) 
              let sum = 0;
              for (const v of a) yield sum += v;


              const changes = [ [1, 1, 1, -1], [1, -1, -1], [1, 1] ];
              const values = changes.map(a => [...sumUp(a)]);

              console.log(values);








              share|improve this answer















              New ESNext features of generators are nice for this.



              Here I've created a simple sumpUp generator that you can re-use.






              function* sumUp(a) 
              let sum = 0;
              for (const v of a) yield sum += v;


              const changes = [ [1, 1, 1, -1], [1, -1, -1], [1, 1] ];
              const values = changes.map(a => [...sumUp(a)]);

              console.log(values);








              function* sumUp(a) 
              let sum = 0;
              for (const v of a) yield sum += v;


              const changes = [ [1, 1, 1, -1], [1, -1, -1], [1, 1] ];
              const values = changes.map(a => [...sumUp(a)]);

              console.log(values);





              function* sumUp(a) 
              let sum = 0;
              for (const v of a) yield sum += v;


              const changes = [ [1, 1, 1, -1], [1, -1, -1], [1, 1] ];
              const values = changes.map(a => [...sumUp(a)]);

              console.log(values);






              share|improve this answer














              share|improve this answer



              share|improve this answer








              edited Mar 20 at 11:18

























              answered Mar 20 at 11:13









              KeithKeith

              9,1031821




              9,1031821





















                  3

















                  const changes = [ [1, 1, 1, -1], [1, -1, -1], [1, 1] ]
                  let values = []
                  changes.forEach(arr =>
                  let accu = 0
                  let nestedArr = []
                  arr.forEach(n =>
                  accu += n
                  nestedArr.push(accu)
                  )
                  values.push(nestedArr)
                  )
                  console.log(values)








                  share|improve this answer



























                    3

















                    const changes = [ [1, 1, 1, -1], [1, -1, -1], [1, 1] ]
                    let values = []
                    changes.forEach(arr =>
                    let accu = 0
                    let nestedArr = []
                    arr.forEach(n =>
                    accu += n
                    nestedArr.push(accu)
                    )
                    values.push(nestedArr)
                    )
                    console.log(values)








                    share|improve this answer

























                      3












                      3








                      3










                      const changes = [ [1, 1, 1, -1], [1, -1, -1], [1, 1] ]
                      let values = []
                      changes.forEach(arr =>
                      let accu = 0
                      let nestedArr = []
                      arr.forEach(n =>
                      accu += n
                      nestedArr.push(accu)
                      )
                      values.push(nestedArr)
                      )
                      console.log(values)








                      share|improve this answer
















                      const changes = [ [1, 1, 1, -1], [1, -1, -1], [1, 1] ]
                      let values = []
                      changes.forEach(arr =>
                      let accu = 0
                      let nestedArr = []
                      arr.forEach(n =>
                      accu += n
                      nestedArr.push(accu)
                      )
                      values.push(nestedArr)
                      )
                      console.log(values)








                      const changes = [ [1, 1, 1, -1], [1, -1, -1], [1, 1] ]
                      let values = []
                      changes.forEach(arr =>
                      let accu = 0
                      let nestedArr = []
                      arr.forEach(n =>
                      accu += n
                      nestedArr.push(accu)
                      )
                      values.push(nestedArr)
                      )
                      console.log(values)





                      const changes = [ [1, 1, 1, -1], [1, -1, -1], [1, 1] ]
                      let values = []
                      changes.forEach(arr =>
                      let accu = 0
                      let nestedArr = []
                      arr.forEach(n =>
                      accu += n
                      nestedArr.push(accu)
                      )
                      values.push(nestedArr)
                      )
                      console.log(values)






                      share|improve this answer












                      share|improve this answer



                      share|improve this answer










                      answered Mar 20 at 10:52









                      holydragonholydragon

                      2,74221230




                      2,74221230





















                          3














                          You may use map function of Array




                          const changes = [ [1, 1, 1, -1], [1, -1, -1], [1, 1] ]; 
                          const result = changes.map((v) => v.slice(0).map((t, i, arr) => i === 0 ? t : (arr[i] += arr[i - 1])))
                          console.log(changes);
                          console.log(result);





                          Update



                          Use slice to clone array. This will prevent changes to the original array.






                          share|improve this answer




















                          • 3





                            This modifies the source array, which is probably not a good idea.

                            – T.J. Crowder
                            Mar 20 at 10:56











                          • Yes. And slice will help to prevent that. Thanks for the tip

                            – Alexander
                            Mar 20 at 11:02















                          3














                          You may use map function of Array




                          const changes = [ [1, 1, 1, -1], [1, -1, -1], [1, 1] ]; 
                          const result = changes.map((v) => v.slice(0).map((t, i, arr) => i === 0 ? t : (arr[i] += arr[i - 1])))
                          console.log(changes);
                          console.log(result);





                          Update



                          Use slice to clone array. This will prevent changes to the original array.






                          share|improve this answer




















                          • 3





                            This modifies the source array, which is probably not a good idea.

                            – T.J. Crowder
                            Mar 20 at 10:56











                          • Yes. And slice will help to prevent that. Thanks for the tip

                            – Alexander
                            Mar 20 at 11:02













                          3












                          3








                          3







                          You may use map function of Array




                          const changes = [ [1, 1, 1, -1], [1, -1, -1], [1, 1] ]; 
                          const result = changes.map((v) => v.slice(0).map((t, i, arr) => i === 0 ? t : (arr[i] += arr[i - 1])))
                          console.log(changes);
                          console.log(result);





                          Update



                          Use slice to clone array. This will prevent changes to the original array.






                          share|improve this answer















                          You may use map function of Array




                          const changes = [ [1, 1, 1, -1], [1, -1, -1], [1, 1] ]; 
                          const result = changes.map((v) => v.slice(0).map((t, i, arr) => i === 0 ? t : (arr[i] += arr[i - 1])))
                          console.log(changes);
                          console.log(result);





                          Update



                          Use slice to clone array. This will prevent changes to the original array.






                          const changes = [ [1, 1, 1, -1], [1, -1, -1], [1, 1] ]; 
                          const result = changes.map((v) => v.slice(0).map((t, i, arr) => i === 0 ? t : (arr[i] += arr[i - 1])))
                          console.log(changes);
                          console.log(result);





                          const changes = [ [1, 1, 1, -1], [1, -1, -1], [1, 1] ]; 
                          const result = changes.map((v) => v.slice(0).map((t, i, arr) => i === 0 ? t : (arr[i] += arr[i - 1])))
                          console.log(changes);
                          console.log(result);






                          share|improve this answer














                          share|improve this answer



                          share|improve this answer








                          edited Mar 20 at 11:01

























                          answered Mar 20 at 10:51









                          AlexanderAlexander

                          1,024214




                          1,024214







                          • 3





                            This modifies the source array, which is probably not a good idea.

                            – T.J. Crowder
                            Mar 20 at 10:56











                          • Yes. And slice will help to prevent that. Thanks for the tip

                            – Alexander
                            Mar 20 at 11:02












                          • 3





                            This modifies the source array, which is probably not a good idea.

                            – T.J. Crowder
                            Mar 20 at 10:56











                          • Yes. And slice will help to prevent that. Thanks for the tip

                            – Alexander
                            Mar 20 at 11:02







                          3




                          3





                          This modifies the source array, which is probably not a good idea.

                          – T.J. Crowder
                          Mar 20 at 10:56





                          This modifies the source array, which is probably not a good idea.

                          – T.J. Crowder
                          Mar 20 at 10:56













                          Yes. And slice will help to prevent that. Thanks for the tip

                          – Alexander
                          Mar 20 at 11:02





                          Yes. And slice will help to prevent that. Thanks for the tip

                          – Alexander
                          Mar 20 at 11:02











                          2














                          Here is an easier to read way that iterates over the outer list of arrays. A copy of the inner array is made to keep the initial values (like [1, 1, 1, -1]). It then iterates over each value in the copied array and adds it to each index after it in the original array.






                          var changes = [[1, 1, 1, -1], [1, -1, -1], [1, 1]];
                          changes.forEach(subArray =>
                          var subArrayCopy = subArray.slice(); // Create a copy of the current sub array (i.e. subArrayCopy = [1, 1, 1, -1];)
                          subArrayCopy.forEach((val, index) => // Iterate through each value in the copy
                          for (var i = subArray.length - 1; i > index; i--) // For each element from the end to the current index
                          subArray[i] += val; // Add the copy's current index value to the original array

                          );
                          )
                          console.log(changes);








                          share|improve this answer



























                            2














                            Here is an easier to read way that iterates over the outer list of arrays. A copy of the inner array is made to keep the initial values (like [1, 1, 1, -1]). It then iterates over each value in the copied array and adds it to each index after it in the original array.






                            var changes = [[1, 1, 1, -1], [1, -1, -1], [1, 1]];
                            changes.forEach(subArray =>
                            var subArrayCopy = subArray.slice(); // Create a copy of the current sub array (i.e. subArrayCopy = [1, 1, 1, -1];)
                            subArrayCopy.forEach((val, index) => // Iterate through each value in the copy
                            for (var i = subArray.length - 1; i > index; i--) // For each element from the end to the current index
                            subArray[i] += val; // Add the copy's current index value to the original array

                            );
                            )
                            console.log(changes);








                            share|improve this answer

























                              2












                              2








                              2







                              Here is an easier to read way that iterates over the outer list of arrays. A copy of the inner array is made to keep the initial values (like [1, 1, 1, -1]). It then iterates over each value in the copied array and adds it to each index after it in the original array.






                              var changes = [[1, 1, 1, -1], [1, -1, -1], [1, 1]];
                              changes.forEach(subArray =>
                              var subArrayCopy = subArray.slice(); // Create a copy of the current sub array (i.e. subArrayCopy = [1, 1, 1, -1];)
                              subArrayCopy.forEach((val, index) => // Iterate through each value in the copy
                              for (var i = subArray.length - 1; i > index; i--) // For each element from the end to the current index
                              subArray[i] += val; // Add the copy's current index value to the original array

                              );
                              )
                              console.log(changes);








                              share|improve this answer













                              Here is an easier to read way that iterates over the outer list of arrays. A copy of the inner array is made to keep the initial values (like [1, 1, 1, -1]). It then iterates over each value in the copied array and adds it to each index after it in the original array.






                              var changes = [[1, 1, 1, -1], [1, -1, -1], [1, 1]];
                              changes.forEach(subArray =>
                              var subArrayCopy = subArray.slice(); // Create a copy of the current sub array (i.e. subArrayCopy = [1, 1, 1, -1];)
                              subArrayCopy.forEach((val, index) => // Iterate through each value in the copy
                              for (var i = subArray.length - 1; i > index; i--) // For each element from the end to the current index
                              subArray[i] += val; // Add the copy's current index value to the original array

                              );
                              )
                              console.log(changes);








                              var changes = [[1, 1, 1, -1], [1, -1, -1], [1, 1]];
                              changes.forEach(subArray =>
                              var subArrayCopy = subArray.slice(); // Create a copy of the current sub array (i.e. subArrayCopy = [1, 1, 1, -1];)
                              subArrayCopy.forEach((val, index) => // Iterate through each value in the copy
                              for (var i = subArray.length - 1; i > index; i--) // For each element from the end to the current index
                              subArray[i] += val; // Add the copy's current index value to the original array

                              );
                              )
                              console.log(changes);





                              var changes = [[1, 1, 1, -1], [1, -1, -1], [1, 1]];
                              changes.forEach(subArray =>
                              var subArrayCopy = subArray.slice(); // Create a copy of the current sub array (i.e. subArrayCopy = [1, 1, 1, -1];)
                              subArrayCopy.forEach((val, index) => // Iterate through each value in the copy
                              for (var i = subArray.length - 1; i > index; i--) // For each element from the end to the current index
                              subArray[i] += val; // Add the copy's current index value to the original array

                              );
                              )
                              console.log(changes);






                              share|improve this answer












                              share|improve this answer



                              share|improve this answer










                              answered Mar 20 at 13:06









                              Nick GNick G

                              1,029614




                              1,029614





















                                  2














                                  Another way,



                                  You can use .map to return your new array with the desired results. By using .reduce with an array as an accumulator, you can generate the subarray.






                                  var array = [[1, 1, 1, -1], [1, -1, -1], [1, 1]],
                                  result = array.map(a => a.reduce((ac, v, i) => , []));

                                  console.log(result);

                                  // shorter
                                  result = array.map(a => a.reduce((ac, v, i) => [...ac, (ac[i-1] || 0) + v], []));
                                  console.log(result);








                                  share|improve this answer





























                                    2














                                    Another way,



                                    You can use .map to return your new array with the desired results. By using .reduce with an array as an accumulator, you can generate the subarray.






                                    var array = [[1, 1, 1, -1], [1, -1, -1], [1, 1]],
                                    result = array.map(a => a.reduce((ac, v, i) => , []));

                                    console.log(result);

                                    // shorter
                                    result = array.map(a => a.reduce((ac, v, i) => [...ac, (ac[i-1] || 0) + v], []));
                                    console.log(result);








                                    share|improve this answer



























                                      2












                                      2








                                      2







                                      Another way,



                                      You can use .map to return your new array with the desired results. By using .reduce with an array as an accumulator, you can generate the subarray.






                                      var array = [[1, 1, 1, -1], [1, -1, -1], [1, 1]],
                                      result = array.map(a => a.reduce((ac, v, i) => , []));

                                      console.log(result);

                                      // shorter
                                      result = array.map(a => a.reduce((ac, v, i) => [...ac, (ac[i-1] || 0) + v], []));
                                      console.log(result);








                                      share|improve this answer















                                      Another way,



                                      You can use .map to return your new array with the desired results. By using .reduce with an array as an accumulator, you can generate the subarray.






                                      var array = [[1, 1, 1, -1], [1, -1, -1], [1, 1]],
                                      result = array.map(a => a.reduce((ac, v, i) => , []));

                                      console.log(result);

                                      // shorter
                                      result = array.map(a => a.reduce((ac, v, i) => [...ac, (ac[i-1] || 0) + v], []));
                                      console.log(result);








                                      var array = [[1, 1, 1, -1], [1, -1, -1], [1, 1]],
                                      result = array.map(a => a.reduce((ac, v, i) => , []));

                                      console.log(result);

                                      // shorter
                                      result = array.map(a => a.reduce((ac, v, i) => [...ac, (ac[i-1] || 0) + v], []));
                                      console.log(result);





                                      var array = [[1, 1, 1, -1], [1, -1, -1], [1, 1]],
                                      result = array.map(a => a.reduce((ac, v, i) => , []));

                                      console.log(result);

                                      // shorter
                                      result = array.map(a => a.reduce((ac, v, i) => [...ac, (ac[i-1] || 0) + v], []));
                                      console.log(result);






                                      share|improve this answer














                                      share|improve this answer



                                      share|improve this answer








                                      edited Mar 20 at 14:37

























                                      answered Mar 20 at 12:12









                                      R3tepR3tep

                                      8,14382962




                                      8,14382962



























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Hall Of Fame””Slayer Wins 'Best Metal' Grammy Award””Slayer Guitarist Jeff Hanneman Dies””Bullet-For My Valentine booed at Metal Hammer Golden Gods Awards””Unholy Aliance””The End Of Slayer?””Slayer: We Could Thrash Out Two More Albums If We're Fast Enough...””'The Unholy Alliance: Chapter III' UK Dates Added”originalet”Megadeth And Slayer To Co-Headline 'Canadian Carnage' Trek”originalet”World Painted Blood””Release “World Painted Blood” by Slayer””Metallica Heading To Cinemas””Slayer, Megadeth To Join Forces For 'European Carnage' Tour - Dec. 18, 2010”originalet”Slayer's Hanneman Contracts Acute Infection; Band To Bring In Guest Guitarist””Cannibal Corpse's Pat O'Brien Will Step In As Slayer's Guest Guitarist”originalet”Slayer’s Jeff Hanneman Dead at 49””Dave Lombardo Says He Made Only $67,000 In 2011 While Touring With Slayer””Slayer: We Do Not Agree With Dave Lombardo's Substance Or Timeline Of Events””Slayer Welcomes Drummer Paul Bostaph Back To The Fold””Slayer Hope to Unveil Never-Before-Heard Jeff Hanneman Material on Next Album””Slayer Debut New Song 'Implode' During Surprise Golden Gods Appearance””Release group Repentless by Slayer””Repentless - Slayer - Credits””Slayer””Metal Storm Awards 2015””Slayer - to release comic book "Repentless #1"””Slayer To Release 'Repentless' 6.66" Vinyl Box Set””BREAKING NEWS: Slayer Announce Farewell Tour””Slayer Recruit Lamb of God, Anthrax, Behemoth + Testament for Final Tour””Slayer lägger ner efter 37 år””Slayer Announces Second North American Leg Of 'Final' Tour””Final World Tour””Slayer Announces Final European Tour With Lamb of God, Anthrax And Obituary””Slayer To Tour Europe With Lamb of God, Anthrax And Obituary””Slayer To Play 'Last French Show Ever' At Next Year's Hellfst””Slayer's Final World Tour Will Extend Into 2019””Death Angel's Rob Cavestany On Slayer's 'Farewell' Tour: 'Some Of Us Could See This Coming'””Testament Has No Plans To Retire Anytime Soon, Says Chuck Billy””Anthrax's Scott Ian On Slayer's 'Farewell' Tour Plans: 'I Was Surprised And I Wasn't Surprised'””Slayer””Slayer's Morbid Schlock””Review/Rock; For Slayer, the Mania Is the Message””Slayer - Biography””Slayer - Reign In Blood”originalet”Dave Lombardo””An exclusive oral history of Slayer”originalet”Exclusive! Interview With Slayer Guitarist Jeff Hanneman”originalet”Thinking Out Loud: Slayer's Kerry King on hair metal, Satan and being polite””Slayer Lyrics””Slayer - Biography””Most influential artists for extreme metal music””Slayer - Reign in Blood””Slayer guitarist Jeff Hanneman dies aged 49””Slatanic Slaughter: A Tribute to Slayer””Gateway to Hell: A Tribute to Slayer””Covered In Blood””Slayer: The Origins of Thrash in San Francisco, CA.””Why They Rule - #6 Slayer”originalet”Guitar World's 100 Greatest Heavy Metal Guitarists Of All Time”originalet”The fans have spoken: Slayer comes out on top in readers' polls”originalet”Tribute to Jeff Hanneman (1964-2013)””Lamb Of God Frontman: We Sound Like A Slayer Rip-Off””BEHEMOTH Frontman Pays Tribute To SLAYER's JEFF HANNEMAN””Slayer, Hatebreed Doing Double Duty On This Year's Ozzfest””System of a Down””Lacuna Coil’s Andrea Ferro Talks Influences, Skateboarding, Band Origins + More””Slayer - Reign in Blood””Into The Lungs of Hell””Slayer rules - en utställning om fans””Slayer and Their Fans Slashed Through a No-Holds-Barred Night at Gas Monkey””Home””Slayer””Gold & Platinum - The Big 4 Live from Sofia, Bulgaria””Exclusive! Interview With Slayer Guitarist Kerry King””2008-02-23: Wiltern, Los Angeles, CA, USA””Slayer's Kerry King To Perform With Megadeth Tonight! - Oct. 21, 2010”originalet”Dave Lombardo - Biography”Slayer Case DismissedArkiveradUltimate Classic Rock: Slayer guitarist Jeff Hanneman dead at 49.”Slayer: "We could never do any thing like Some Kind Of Monster..."””Cannibal Corpse'S Pat O'Brien Will Step In As Slayer'S Guest Guitarist | The Official Slayer Site”originalet”Slayer Wins 'Best Metal' Grammy Award””Slayer Guitarist Jeff Hanneman Dies””Kerrang! Awards 2006 Blog: Kerrang! Hall Of Fame””Kerrang! Awards 2013: Kerrang! Legend”originalet”Metallica, Slayer, Iron Maien Among Winners At Metal Hammer Awards””Metal Hammer Golden Gods Awards””Bullet For My Valentine Booed At Metal Hammer Golden Gods Awards””Metal Storm Awards 2006””Metal Storm Awards 2015””Slayer's Concert History””Slayer - Relationships””Slayer - Releases”Slayers officiella webbplatsSlayer på MusicBrainzOfficiell webbplatsSlayerSlayerr1373445760000 0001 1540 47353068615-5086262726cb13906545x(data)6033143kn20030215029