JS Array flattening

JS implementation flattening the array, expanding the multidimensional array into a one-dimensional array

Method One, recursion

function Flatten (arr) {let    result = [];    for (let i=0;i<arr.length;i++) {        if (Array.isarray (Arr[i])) {            result = Result.concat (Flatten (arr[i)));        }        else{            Result.push (Arr[i]);        }    }    return result;} Console.log (Flatten ([' A ', [' B ', ' C ', [7, 8]],[4,5,[6]]))

Method Two, Arrary.reduce

function Flatten2 (arr) {   return  arr.reduce ((accumulator,currentvalue) =         Accumulator.concat ( Array.isarray (currentvalue)? Flatten2 (CurrentValue): CurrentValue),        []);} Console.log (Flatten2 ([' A ', [' B ', ' C ', [7, 8]],[4,5,[6]]));

Review Upgrade: Requires this function to accept a parameter to determine the flattening depth

function Flatten_deep (arr, deep) {let    result = [];    if (Array.isarray (arr) && deep > 0) {for        (let i = 0; i < arr.length; i++) {            result = Result.concat ( Flatten_deep (Arr[i], deep-1));        }    }    else {        Result.push (arr);    }    return result;} Console.log (Flatten_deep ([' A ', [' B ', ' C ', [7, 8]],[4,5,[6,[' DD ', ' WHIDHW ']]]],3));

　　

JS Array flattening