Question

How to flatten array in JavaScript

Answer 1

const arr = [[1,2], [3,4], [5,6], [7], [8,9,10]];
const arr_flat = arr.flat();

for (let i = 0; i < arr_flat.length; i++)    
    console.log(arr_flat[i]);



/*
run:

1
2
3
4
5
6
7
8
9
10

*/

 

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Answer 2

const arr = [[1,2], [3,[4,5],6], [7], [8,9,10]];
const arr_flat = arr.flat();

for (let i = 0; i < arr_flat.length; i++)    
    console.log(arr_flat[i]);



/*
run:

1
2
3
(2)[4, 5]
6
7
8
9
10

*/

 

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Answer 3

const arr = [[1,2], [3,[4,5],6], [7], [8,9,10]];
const arr_flat = arr.flat(2);

for (let i = 0; i < arr_flat.length; i++)    
    console.log(arr_flat[i]);



/*
run:

1
2
3
4
5
6
7
8
9
10

*/

 

70+ SQL courses for beginners and professionals