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Flatten multidimensional array to one dimension

2022-08-08 04:29:00 【zjLOVEcyj】

Multidimensional array flattened to 1D
[1, [2,3], [4,[5, [6]]]]
[ 1, 2, 3, 4, 5, 6 ]

Using reduce and recursion to achieve

let arr = [1, [2,3], [4,[5, [6]]]]function flatten (arr) {return arr.reduce((pre, cur) => pre.concat(Array.isArray(cur) ? flatten(cur) : cur), [])}flatten(arr)

js native method

arr.flat(Infinity)

The second parameter is the dimension of the multi-dimensional array, which can be set to Infinity, which can flatten the infinite multi-dimensional array. When it is set to 2, it means that the arr will be flattened to 2 layers
For example, arr = [ 1, [ 2, 3], [4, [ 5, [ 6 ] ] ] ]
Then arr.flat(2) is [ 1, 2, 3, 4, 5, [ 6 ] ]

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