Interview questions: JavaScript multidimensional array conversion one dimension

Topic:

var array = [1, [2, 3, [4, 5,], 6], 7, 8];

Write a method Flatarray (array), get [1, 2, 3, 4, 5, 6, 7, 8]

Answer:

1. Two force notation:

function Flatarray (arr) {    var temp =  arr.join (). Split (', '),        = temp.length,        = [];      for (var i=0; i<len; i++) {        Result.push (parseint (Temp[i]));    }     return result;}

　

2. Recursion:

functionFlatarray (arr) {varresult = [];  for(vari = 0, L = arr.length; I < L; i++){        if(Arr[i]instanceofArray) {Result=Result.concat (Arguments.callee (arr[i)); //or result = Result.concat (Flatarray.call (this, arr[i]));        }        Else{Result.push (arr[i]); }    }    returnresult;}

3.forEach (or map, reduce, etc.)

function Flatarray (arr) {    var result = [];    Arr.foreach (function(item, Index, origin) {        ? result = Result.concat (Flatarray ( Item)): Result.push (item);    })     return result;}

4. High-end notation (closures):

var function (ret    ){function  Toarr (arr) {        Arr.foreach (function(item)            {  instanceof Array? Toarr (item): Ret.push (item);        });    }         return function (arr) {        Toarr (arr);         return ret;    }    } ([]);

Interview questions: JavaScript multidimensional array conversion one dimension