Multidimensional array to one-dimensional array

Method One: Using the array concat method, this method belongs to a trickery

var arr= [[0,0,1],[2,3,3],[4,4,5]]; var newArr = [];  for (var i=0;i<arr.length;i++) {     newArr=newarr.concat (arr[i])            }
Console.log (arr)  //[[0,0,1],[2,3,3],[4,4,5]];
Console.log (NEWARR)  //[0, 0, 1, 2, 3, 3, 4, 4, 5]

Method Two: is also the array join method, but one drawback is that each item of the array becomes a string

var arr=[1,[2,[[3,4],5],6]];

function
   return arr.join (). Split (","

Console.log (Getarr(arr));

Method Three: 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]

Method four: For In loop recursion

In fact, the fourth kind is similar to the third one.

var arr =[1,[2,[[3,4],5],6]];
var newarr=
function
    for (var in
       ifinstanceof  Array) {
               Getarr
 } Else
 
 
 return  newArr;

Console.log (Getarr (arr));

Multidimensional array to one-dimensional array