How can I split my array into multiple smaller arrays?

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up vote
7
down vote

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My target is to split the given array into smaller arrays using JavaScript. For example [1, 2, 3, 4] should be split to [1] [1, 2] [1, 2, 3] [1, 2, 3, 4] [2] [2, 3] [2, 3, 4] [3] [3, 4] [4].



I am using this code:






let arr = [1, 2, 3, 4];

for (let i = 1; i <= arr.length; i++)
let a = ;
for (let j = 0; j < arr.length; j++)
a.push(arr[j]);
if (a.length === i)
break;


console.log(a);





And I get the following result: [1] [1, 2] [1, 2, 3] [1, 2, 3, 4] undefined



What am I missing/doing wrong?










share|improve this question























  • I think you should set j=i in begin loop
    – Alexandr Kudryashov
    59 mins ago










  • @AlexandrKudryashov I have tried. It is not correct
    – TeodorKolev
    57 mins ago










  • set j=i and remove the if condition in the nested loop
    – rock star
    56 mins ago










  • init i with 0 and remove the = symbol in the corresponding condition
    – rock star
    56 mins ago






  • 1




    @rockstar nope, it is not correct
    – TeodorKolev
    55 mins ago














up vote
7
down vote

favorite
1












My target is to split the given array into smaller arrays using JavaScript. For example [1, 2, 3, 4] should be split to [1] [1, 2] [1, 2, 3] [1, 2, 3, 4] [2] [2, 3] [2, 3, 4] [3] [3, 4] [4].



I am using this code:






let arr = [1, 2, 3, 4];

for (let i = 1; i <= arr.length; i++)
let a = ;
for (let j = 0; j < arr.length; j++)
a.push(arr[j]);
if (a.length === i)
break;


console.log(a);





And I get the following result: [1] [1, 2] [1, 2, 3] [1, 2, 3, 4] undefined



What am I missing/doing wrong?










share|improve this question























  • I think you should set j=i in begin loop
    – Alexandr Kudryashov
    59 mins ago










  • @AlexandrKudryashov I have tried. It is not correct
    – TeodorKolev
    57 mins ago










  • set j=i and remove the if condition in the nested loop
    – rock star
    56 mins ago










  • init i with 0 and remove the = symbol in the corresponding condition
    – rock star
    56 mins ago






  • 1




    @rockstar nope, it is not correct
    – TeodorKolev
    55 mins ago












up vote
7
down vote

favorite
1









up vote
7
down vote

favorite
1






1





My target is to split the given array into smaller arrays using JavaScript. For example [1, 2, 3, 4] should be split to [1] [1, 2] [1, 2, 3] [1, 2, 3, 4] [2] [2, 3] [2, 3, 4] [3] [3, 4] [4].



I am using this code:






let arr = [1, 2, 3, 4];

for (let i = 1; i <= arr.length; i++)
let a = ;
for (let j = 0; j < arr.length; j++)
a.push(arr[j]);
if (a.length === i)
break;


console.log(a);





And I get the following result: [1] [1, 2] [1, 2, 3] [1, 2, 3, 4] undefined



What am I missing/doing wrong?










share|improve this question















My target is to split the given array into smaller arrays using JavaScript. For example [1, 2, 3, 4] should be split to [1] [1, 2] [1, 2, 3] [1, 2, 3, 4] [2] [2, 3] [2, 3, 4] [3] [3, 4] [4].



I am using this code:






let arr = [1, 2, 3, 4];

for (let i = 1; i <= arr.length; i++)
let a = ;
for (let j = 0; j < arr.length; j++)
a.push(arr[j]);
if (a.length === i)
break;


console.log(a);





And I get the following result: [1] [1, 2] [1, 2, 3] [1, 2, 3, 4] undefined



What am I missing/doing wrong?






let arr = [1, 2, 3, 4];

for (let i = 1; i <= arr.length; i++)
let a = ;
for (let j = 0; j < arr.length; j++)
a.push(arr[j]);
if (a.length === i)
break;


console.log(a);





let arr = [1, 2, 3, 4];

for (let i = 1; i <= arr.length; i++)
let a = ;
for (let j = 0; j < arr.length; j++)
a.push(arr[j]);
if (a.length === i)
break;


console.log(a);






javascript arrays






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited 52 mins ago









Jenny O'Reilly

10.1k73651




10.1k73651










asked 1 hour ago









TeodorKolev

95752043




95752043











  • I think you should set j=i in begin loop
    – Alexandr Kudryashov
    59 mins ago










  • @AlexandrKudryashov I have tried. It is not correct
    – TeodorKolev
    57 mins ago










  • set j=i and remove the if condition in the nested loop
    – rock star
    56 mins ago










  • init i with 0 and remove the = symbol in the corresponding condition
    – rock star
    56 mins ago






  • 1




    @rockstar nope, it is not correct
    – TeodorKolev
    55 mins ago
















  • I think you should set j=i in begin loop
    – Alexandr Kudryashov
    59 mins ago










  • @AlexandrKudryashov I have tried. It is not correct
    – TeodorKolev
    57 mins ago










  • set j=i and remove the if condition in the nested loop
    – rock star
    56 mins ago










  • init i with 0 and remove the = symbol in the corresponding condition
    – rock star
    56 mins ago






  • 1




    @rockstar nope, it is not correct
    – TeodorKolev
    55 mins ago















I think you should set j=i in begin loop
– Alexandr Kudryashov
59 mins ago




I think you should set j=i in begin loop
– Alexandr Kudryashov
59 mins ago












@AlexandrKudryashov I have tried. It is not correct
– TeodorKolev
57 mins ago




@AlexandrKudryashov I have tried. It is not correct
– TeodorKolev
57 mins ago












set j=i and remove the if condition in the nested loop
– rock star
56 mins ago




set j=i and remove the if condition in the nested loop
– rock star
56 mins ago












init i with 0 and remove the = symbol in the corresponding condition
– rock star
56 mins ago




init i with 0 and remove the = symbol in the corresponding condition
– rock star
56 mins ago




1




1




@rockstar nope, it is not correct
– TeodorKolev
55 mins ago




@rockstar nope, it is not correct
– TeodorKolev
55 mins ago












5 Answers
5






active

oldest

votes

















up vote
3
down vote



accepted










You have two issues in your code:



  1. You need to have loop to initialize with the value of i for the inner loop so that it consider the next index for new iteration of i

  2. You need to remove that break on the length which you have in inner loop.




let arr = [1, 2, 3, 4];
for (let i = 0; i <= arr.length; i++)
let a = ;
for (let j = i; j < arr.length; j++)
a.push(arr[j]);
console.log(a);









share|improve this answer



























    up vote
    7
    down vote













    For the inner array, you could just start with the index of the outer array.






    var array = [1, 2, 3, 4],
    temp,
    i, j, l = array.length,
    result = ;

    for (i = 0; i < l; i++)
    for (j = i; j < l; j++)
    result.push(array.slice(i, j + 1));


    console.log(result.map(a => a.join(' ')));

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








    share|improve this answer
















    • 1




      I was expecting answer from you :)
      – Ankit Agarwal
      54 mins ago










    • This do one big array. Target is to create small arrays
      – TeodorKolev
      54 mins ago










    • what do you want with small arrays? instead of pushing, you could display the sub array.
      – Nina Scholz
      50 mins ago

















    up vote
    2
    down vote













    Try this






     let arr = [1, 2, 3, 4];
    for (let i = 0; i <= arr.length; i++)
    let a = ;
    var tmp=i;
    for (let j = tmp; j < arr.length; j++)
    a.push(arr[j]);
    console.log(a);









    share|improve this answer






















    • Why do you need the tmp variable?
      – Jenny O'Reilly
      50 mins ago










    • you can do it without tmp variable=)
      – Alexandr Kudryashov
      49 mins ago

















    up vote
    0
    down vote













    i have prepare stackblitz for this case.



    let source = [1,2,3,4];
    const output = ;
    const arrayMultiplier = (source) =>
    const eachValueArray = ;
    source.forEach((item, index) =>
    // Will push new array who will be sliced source array.
    eachValueArray.push(source.slice(0, source.length - index));
    );
    //We reverse array to have right order.
    return eachValueArray.reverse();
    ;

    for(let i = 0; i <= source.length; i++)
    output.push(...arrayMultiplier(source));
    source.shift(); // Will recraft source array by removing first index.

    //Don't forget last item.
    output.push(source);
    console.log(output);


    Is not the most shorten solution but do the job






    share|improve this answer



























      up vote
      0
      down vote













      Use two iteration



      1. get slice array based on loop index.

      2. use sliced array and combine array element.




       var arr = [1, 2, 3, 4];
      let newArra =;
      arr.map((x,i)=>
      let remainArr = arr.slice(i);
      return remainArr.forEach((y, r) => newArra.push(arr.slice(i).slice(0, r+1)))
      )
      newArra.forEach(x=> console.log(x))








      share|improve this answer






















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        5 Answers
        5






        active

        oldest

        votes








        5 Answers
        5






        active

        oldest

        votes









        active

        oldest

        votes






        active

        oldest

        votes








        up vote
        3
        down vote



        accepted










        You have two issues in your code:



        1. You need to have loop to initialize with the value of i for the inner loop so that it consider the next index for new iteration of i

        2. You need to remove that break on the length which you have in inner loop.




        let arr = [1, 2, 3, 4];
        for (let i = 0; i <= arr.length; i++)
        let a = ;
        for (let j = i; j < arr.length; j++)
        a.push(arr[j]);
        console.log(a);









        share|improve this answer
























          up vote
          3
          down vote



          accepted










          You have two issues in your code:



          1. You need to have loop to initialize with the value of i for the inner loop so that it consider the next index for new iteration of i

          2. You need to remove that break on the length which you have in inner loop.




          let arr = [1, 2, 3, 4];
          for (let i = 0; i <= arr.length; i++)
          let a = ;
          for (let j = i; j < arr.length; j++)
          a.push(arr[j]);
          console.log(a);









          share|improve this answer






















            up vote
            3
            down vote



            accepted







            up vote
            3
            down vote



            accepted






            You have two issues in your code:



            1. You need to have loop to initialize with the value of i for the inner loop so that it consider the next index for new iteration of i

            2. You need to remove that break on the length which you have in inner loop.




            let arr = [1, 2, 3, 4];
            for (let i = 0; i <= arr.length; i++)
            let a = ;
            for (let j = i; j < arr.length; j++)
            a.push(arr[j]);
            console.log(a);









            share|improve this answer












            You have two issues in your code:



            1. You need to have loop to initialize with the value of i for the inner loop so that it consider the next index for new iteration of i

            2. You need to remove that break on the length which you have in inner loop.




            let arr = [1, 2, 3, 4];
            for (let i = 0; i <= arr.length; i++)
            let a = ;
            for (let j = i; j < arr.length; j++)
            a.push(arr[j]);
            console.log(a);









            let arr = [1, 2, 3, 4];
            for (let i = 0; i <= arr.length; i++)
            let a = ;
            for (let j = i; j < arr.length; j++)
            a.push(arr[j]);
            console.log(a);






            let arr = [1, 2, 3, 4];
            for (let i = 0; i <= arr.length; i++)
            let a = ;
            for (let j = i; j < arr.length; j++)
            a.push(arr[j]);
            console.log(a);







            share|improve this answer












            share|improve this answer



            share|improve this answer










            answered 50 mins ago









            Ankit Agarwal

            20.8k31840




            20.8k31840






















                up vote
                7
                down vote













                For the inner array, you could just start with the index of the outer array.






                var array = [1, 2, 3, 4],
                temp,
                i, j, l = array.length,
                result = ;

                for (i = 0; i < l; i++)
                for (j = i; j < l; j++)
                result.push(array.slice(i, j + 1));


                console.log(result.map(a => a.join(' ')));

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








                share|improve this answer
















                • 1




                  I was expecting answer from you :)
                  – Ankit Agarwal
                  54 mins ago










                • This do one big array. Target is to create small arrays
                  – TeodorKolev
                  54 mins ago










                • what do you want with small arrays? instead of pushing, you could display the sub array.
                  – Nina Scholz
                  50 mins ago














                up vote
                7
                down vote













                For the inner array, you could just start with the index of the outer array.






                var array = [1, 2, 3, 4],
                temp,
                i, j, l = array.length,
                result = ;

                for (i = 0; i < l; i++)
                for (j = i; j < l; j++)
                result.push(array.slice(i, j + 1));


                console.log(result.map(a => a.join(' ')));

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








                share|improve this answer
















                • 1




                  I was expecting answer from you :)
                  – Ankit Agarwal
                  54 mins ago










                • This do one big array. Target is to create small arrays
                  – TeodorKolev
                  54 mins ago










                • what do you want with small arrays? instead of pushing, you could display the sub array.
                  – Nina Scholz
                  50 mins ago












                up vote
                7
                down vote










                up vote
                7
                down vote









                For the inner array, you could just start with the index of the outer array.






                var array = [1, 2, 3, 4],
                temp,
                i, j, l = array.length,
                result = ;

                for (i = 0; i < l; i++)
                for (j = i; j < l; j++)
                result.push(array.slice(i, j + 1));


                console.log(result.map(a => a.join(' ')));

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








                share|improve this answer












                For the inner array, you could just start with the index of the outer array.






                var array = [1, 2, 3, 4],
                temp,
                i, j, l = array.length,
                result = ;

                for (i = 0; i < l; i++)
                for (j = i; j < l; j++)
                result.push(array.slice(i, j + 1));


                console.log(result.map(a => a.join(' ')));

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








                var array = [1, 2, 3, 4],
                temp,
                i, j, l = array.length,
                result = ;

                for (i = 0; i < l; i++)
                for (j = i; j < l; j++)
                result.push(array.slice(i, j + 1));


                console.log(result.map(a => a.join(' ')));

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





                var array = [1, 2, 3, 4],
                temp,
                i, j, l = array.length,
                result = ;

                for (i = 0; i < l; i++)
                for (j = i; j < l; j++)
                result.push(array.slice(i, j + 1));


                console.log(result.map(a => a.join(' ')));

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






                share|improve this answer












                share|improve this answer



                share|improve this answer










                answered 56 mins ago









                Nina Scholz

                158k1277136




                158k1277136







                • 1




                  I was expecting answer from you :)
                  – Ankit Agarwal
                  54 mins ago










                • This do one big array. Target is to create small arrays
                  – TeodorKolev
                  54 mins ago










                • what do you want with small arrays? instead of pushing, you could display the sub array.
                  – Nina Scholz
                  50 mins ago












                • 1




                  I was expecting answer from you :)
                  – Ankit Agarwal
                  54 mins ago










                • This do one big array. Target is to create small arrays
                  – TeodorKolev
                  54 mins ago










                • what do you want with small arrays? instead of pushing, you could display the sub array.
                  – Nina Scholz
                  50 mins ago







                1




                1




                I was expecting answer from you :)
                – Ankit Agarwal
                54 mins ago




                I was expecting answer from you :)
                – Ankit Agarwal
                54 mins ago












                This do one big array. Target is to create small arrays
                – TeodorKolev
                54 mins ago




                This do one big array. Target is to create small arrays
                – TeodorKolev
                54 mins ago












                what do you want with small arrays? instead of pushing, you could display the sub array.
                – Nina Scholz
                50 mins ago




                what do you want with small arrays? instead of pushing, you could display the sub array.
                – Nina Scholz
                50 mins ago










                up vote
                2
                down vote













                Try this






                 let arr = [1, 2, 3, 4];
                for (let i = 0; i <= arr.length; i++)
                let a = ;
                var tmp=i;
                for (let j = tmp; j < arr.length; j++)
                a.push(arr[j]);
                console.log(a);









                share|improve this answer






















                • Why do you need the tmp variable?
                  – Jenny O'Reilly
                  50 mins ago










                • you can do it without tmp variable=)
                  – Alexandr Kudryashov
                  49 mins ago














                up vote
                2
                down vote













                Try this






                 let arr = [1, 2, 3, 4];
                for (let i = 0; i <= arr.length; i++)
                let a = ;
                var tmp=i;
                for (let j = tmp; j < arr.length; j++)
                a.push(arr[j]);
                console.log(a);









                share|improve this answer






















                • Why do you need the tmp variable?
                  – Jenny O'Reilly
                  50 mins ago










                • you can do it without tmp variable=)
                  – Alexandr Kudryashov
                  49 mins ago












                up vote
                2
                down vote










                up vote
                2
                down vote









                Try this






                 let arr = [1, 2, 3, 4];
                for (let i = 0; i <= arr.length; i++)
                let a = ;
                var tmp=i;
                for (let j = tmp; j < arr.length; j++)
                a.push(arr[j]);
                console.log(a);









                share|improve this answer














                Try this






                 let arr = [1, 2, 3, 4];
                for (let i = 0; i <= arr.length; i++)
                let a = ;
                var tmp=i;
                for (let j = tmp; j < arr.length; j++)
                a.push(arr[j]);
                console.log(a);









                 let arr = [1, 2, 3, 4];
                for (let i = 0; i <= arr.length; i++)
                let a = ;
                var tmp=i;
                for (let j = tmp; j < arr.length; j++)
                a.push(arr[j]);
                console.log(a);






                 let arr = [1, 2, 3, 4];
                for (let i = 0; i <= arr.length; i++)
                let a = ;
                var tmp=i;
                for (let j = tmp; j < arr.length; j++)
                a.push(arr[j]);
                console.log(a);







                share|improve this answer














                share|improve this answer



                share|improve this answer








                edited 52 mins ago









                Sudhir Ojha

                1,024313




                1,024313










                answered 53 mins ago









                Alexandr Kudryashov

                559213




                559213











                • Why do you need the tmp variable?
                  – Jenny O'Reilly
                  50 mins ago










                • you can do it without tmp variable=)
                  – Alexandr Kudryashov
                  49 mins ago
















                • Why do you need the tmp variable?
                  – Jenny O'Reilly
                  50 mins ago










                • you can do it without tmp variable=)
                  – Alexandr Kudryashov
                  49 mins ago















                Why do you need the tmp variable?
                – Jenny O'Reilly
                50 mins ago




                Why do you need the tmp variable?
                – Jenny O'Reilly
                50 mins ago












                you can do it without tmp variable=)
                – Alexandr Kudryashov
                49 mins ago




                you can do it without tmp variable=)
                – Alexandr Kudryashov
                49 mins ago










                up vote
                0
                down vote













                i have prepare stackblitz for this case.



                let source = [1,2,3,4];
                const output = ;
                const arrayMultiplier = (source) =>
                const eachValueArray = ;
                source.forEach((item, index) =>
                // Will push new array who will be sliced source array.
                eachValueArray.push(source.slice(0, source.length - index));
                );
                //We reverse array to have right order.
                return eachValueArray.reverse();
                ;

                for(let i = 0; i <= source.length; i++)
                output.push(...arrayMultiplier(source));
                source.shift(); // Will recraft source array by removing first index.

                //Don't forget last item.
                output.push(source);
                console.log(output);


                Is not the most shorten solution but do the job






                share|improve this answer
























                  up vote
                  0
                  down vote













                  i have prepare stackblitz for this case.



                  let source = [1,2,3,4];
                  const output = ;
                  const arrayMultiplier = (source) =>
                  const eachValueArray = ;
                  source.forEach((item, index) =>
                  // Will push new array who will be sliced source array.
                  eachValueArray.push(source.slice(0, source.length - index));
                  );
                  //We reverse array to have right order.
                  return eachValueArray.reverse();
                  ;

                  for(let i = 0; i <= source.length; i++)
                  output.push(...arrayMultiplier(source));
                  source.shift(); // Will recraft source array by removing first index.

                  //Don't forget last item.
                  output.push(source);
                  console.log(output);


                  Is not the most shorten solution but do the job






                  share|improve this answer






















                    up vote
                    0
                    down vote










                    up vote
                    0
                    down vote









                    i have prepare stackblitz for this case.



                    let source = [1,2,3,4];
                    const output = ;
                    const arrayMultiplier = (source) =>
                    const eachValueArray = ;
                    source.forEach((item, index) =>
                    // Will push new array who will be sliced source array.
                    eachValueArray.push(source.slice(0, source.length - index));
                    );
                    //We reverse array to have right order.
                    return eachValueArray.reverse();
                    ;

                    for(let i = 0; i <= source.length; i++)
                    output.push(...arrayMultiplier(source));
                    source.shift(); // Will recraft source array by removing first index.

                    //Don't forget last item.
                    output.push(source);
                    console.log(output);


                    Is not the most shorten solution but do the job






                    share|improve this answer












                    i have prepare stackblitz for this case.



                    let source = [1,2,3,4];
                    const output = ;
                    const arrayMultiplier = (source) =>
                    const eachValueArray = ;
                    source.forEach((item, index) =>
                    // Will push new array who will be sliced source array.
                    eachValueArray.push(source.slice(0, source.length - index));
                    );
                    //We reverse array to have right order.
                    return eachValueArray.reverse();
                    ;

                    for(let i = 0; i <= source.length; i++)
                    output.push(...arrayMultiplier(source));
                    source.shift(); // Will recraft source array by removing first index.

                    //Don't forget last item.
                    output.push(source);
                    console.log(output);


                    Is not the most shorten solution but do the job







                    share|improve this answer












                    share|improve this answer



                    share|improve this answer










                    answered 37 mins ago









                    Yanis-git

                    1,3151217




                    1,3151217




















                        up vote
                        0
                        down vote













                        Use two iteration



                        1. get slice array based on loop index.

                        2. use sliced array and combine array element.




                         var arr = [1, 2, 3, 4];
                        let newArra =;
                        arr.map((x,i)=>
                        let remainArr = arr.slice(i);
                        return remainArr.forEach((y, r) => newArra.push(arr.slice(i).slice(0, r+1)))
                        )
                        newArra.forEach(x=> console.log(x))








                        share|improve this answer


























                          up vote
                          0
                          down vote













                          Use two iteration



                          1. get slice array based on loop index.

                          2. use sliced array and combine array element.




                           var arr = [1, 2, 3, 4];
                          let newArra =;
                          arr.map((x,i)=>
                          let remainArr = arr.slice(i);
                          return remainArr.forEach((y, r) => newArra.push(arr.slice(i).slice(0, r+1)))
                          )
                          newArra.forEach(x=> console.log(x))








                          share|improve this answer
























                            up vote
                            0
                            down vote










                            up vote
                            0
                            down vote









                            Use two iteration



                            1. get slice array based on loop index.

                            2. use sliced array and combine array element.




                             var arr = [1, 2, 3, 4];
                            let newArra =;
                            arr.map((x,i)=>
                            let remainArr = arr.slice(i);
                            return remainArr.forEach((y, r) => newArra.push(arr.slice(i).slice(0, r+1)))
                            )
                            newArra.forEach(x=> console.log(x))








                            share|improve this answer














                            Use two iteration



                            1. get slice array based on loop index.

                            2. use sliced array and combine array element.




                             var arr = [1, 2, 3, 4];
                            let newArra =;
                            arr.map((x,i)=>
                            let remainArr = arr.slice(i);
                            return remainArr.forEach((y, r) => newArra.push(arr.slice(i).slice(0, r+1)))
                            )
                            newArra.forEach(x=> console.log(x))








                             var arr = [1, 2, 3, 4];
                            let newArra =;
                            arr.map((x,i)=>
                            let remainArr = arr.slice(i);
                            return remainArr.forEach((y, r) => newArra.push(arr.slice(i).slice(0, r+1)))
                            )
                            newArra.forEach(x=> console.log(x))





                             var arr = [1, 2, 3, 4];
                            let newArra =;
                            arr.map((x,i)=>
                            let remainArr = arr.slice(i);
                            return remainArr.forEach((y, r) => newArra.push(arr.slice(i).slice(0, r+1)))
                            )
                            newArra.forEach(x=> console.log(x))






                            share|improve this answer














                            share|improve this answer



                            share|improve this answer








                            edited 31 mins ago

























                            answered 43 mins ago









                            Anoop

                            18.8k94468




                            18.8k94468



























                                 

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