javascript - How can I return the array object from Array's prototype function? -


i have programming exercise create 2 prototypes of array, both functions. have put code below. 1 called on other shown in last line. trying second function modify value have been returned calling first function. code below, want output [4,6,4000], instead length of array after push, i.e. 3 in case.

array.prototype.totwenty = function()  {     return [4,6]; }; array.prototype.search = function (lb) {      if(lb >2)     {         //this doesn't work         return this.push(4000);     } };  var man = []; console.log(man.totwenty().search(6));  //console.log returns 3, need return [4,6,4000]

my searches led me arguments.callee.caller didn't try that's being deprecated , can't use it.

please me? i've tried read prototype inheritance, chaining , cascading can't seem extract answer. help

quoting mdn on array.prototype.push,

the push() method adds 1 or more elements end of array , returns new length of array.

so, this.push(4000) pushes value, returning result of push, getting current length of array 3.

instead, should return array object itself, this

array.prototype.totwenty = function () {     return [4, 6]; };  array.prototype.search = function (lb) {     if (lb > 2) {         this.push(4000);            // don't return here     }     return this;                    // return array object itself. };  console.log([].totwenty().search(6)); // [ 4, 6, 4000 ]

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