A multidimensional array to one dimension in JS

Method One: Use the array map () method, which runs the given function for each item in an array, and returns a list of the results of each function call.

Let arr = [1, [2, [[3,4],5],6]];function Onedimensionalarray (arr) {        "). Split (','//  Convert the array to a string and then comma-delimited to array let        arr2 = Arr1.map (function (x            ) {return number (x);        });         return arr2;} Console.log (Onedimensionalarray (arr));

Law two: Using apply combined with concat, the disadvantage is that only two-dimensional to one-dimensional, multi-dimensional array is wrong.

Let arr = [1,[2,3],[4,5]];console.log ([].concat.apply ([],arr)];

Method Three: Convert an array to a string and then to an array, with the disadvantage that each item in the array is a string

Let arr = [1,[2,[[3,4],5],6]];let arr2 = Arr.join (', '). Split (', '); Console.log (ARR2);//["1", "2", "3", "4", "5", "6"]

Or

Let C=[1,3,4,5,[6,[0,1,5],9],[2,5,[1,5]],[5]];
Console.log (C.tostring (). Split (', '))

Law IV: Recursion

Let arr = [1, [2, [[3456= [];function Onedimensionalarray (arr) {    for0; i < arr.length; i++) {        if  (Array.isarray (Arr[i])) {            Onedimensionalarray (arr[i]);         Else {            newarr.push (arr[i]);        }     // [1, 2, 3, 4, 5, 6]

Law V: reduce+ recursion

    Use strict ';    Let arr = [1,[2,[[3,4],5],6]];    Const FLATTEN = arr = Arr.reduce (            (acc,val) = Acc.concat (Array.isarray (val)? Flatten (val): Val), []    )    Console.log (Flatten (arr));//[1, 2, 3, 4, 5, 6]

A multidimensional array to one dimension in JS