How to union two arrays in one in chess order

Question

how can I combine this:

let array1 = [1, 2, 3];
let array2 = [4, 5, 6];

// and get this
let result = [1, 4, 2, 5, 3, 6];

Please read [ask]. This question is not in an understandable state, not does it show what you have tried before asking. — E_net4 - Krabbe mit Hüten, May 13 '19 at 19:28
Possible duplicate of [Add items to one array after each item on another array](https://stackoverflow.com/questions/51730761) — adiga, May 13 '19 at 19:29

score 1 · Answer 1 · edited May 13 '19 at 19:38

1

use this:

let array1 = [1, 2, 3];
let array2 = [4, 5, 6];

let result = [];
for (var i = 0; i < array1.length; i++) {
  result.push(array1[i]);
  result.push(array2[i]);
}
console.log(result);

or

let array1 = [1, 2, 3];
let array2 = [4, 5, 6];
let result = array1.reduce(function(arr, v, i) {
  return arr.concat(v, array2[i]);
}, []);

console.log(result);

edited May 13 '19 at 19:38

Murtaza Hussain

2,592
18
21

answered May 13 '19 at 19:31

Farhan

847
6
13

This is great solution, thank you very much, but there is one problem. If in array2 will be less elements than array1 than last element will be 'undefined'. – Alisa Liso May 13 '19 at 19:45
yes.. then in that case you would need to check the length of array2 before trying to get value.. – Farhan May 13 '19 at 19:48

How to union two arrays in one in chess order

1 Answers1