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.

var arr = [1,[2,[[3,4],5],6]]; function Unid (arr) {        var arr1 = (arr + '). Split (', ');   Convert the array to string and then comma-delimited to array        var arr2 = Arr1.map (function(x)            {  return number (x);        });         return arr2;} Console.log (Unid (ARRA));

Law II: Using apply combined with concat, the disadvantage is that only two-dimensional to one-dimensional, multidimensional array is not.

Const 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

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

Law IV: Recursion

var arr = [1,[2,[[3,4],5],6]]; var newArr = [];     function Fun (arr) {        for (var i=0;i<arr.length;i++) {            if( Array.isarray (Arr[i]) {fun                (arr[i]);            } Else {                newarr.push (arr[i]);            }        }    } Fun (arr); Console.log (NEWARR); // [1, 2, 3, 4, 5, 6]

Law V: reduce+ recursion

    Use strict ';    var 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