Nodejs Array Map map(func)

Method Source Code

Array.prototype.map = function(func){
  var result = [];
  forEach(this, function (element) {
    result.push(func(element));//from w  ww . j a  va 2s  .  c om
  });
  return result;
}

Related

1. map(fn,thisObj)

   if(!Array.prototype.map) {
   Array.prototype.map = function(fn,thisObj)
     var scope = thisObj || window;
     var a = [];
     for(var i=0, j=this.length; i < j; ++i) {
       a.push(fn.call(scope,this[i],i,this));
     return a;
   ...
   

2. map(from, to)

   Array.prototype.map = function(from, to) {
       var newArray = [];
       for (var i = 0; i < this.length; i++) {
           if (this[i][from] != undefined && this[i][to] != undefined) {
               newArray[this[i][from]] = this[i][to];
       return newArray;
   };
   ...
   

3. map(fun /*, thisp*/)

   Array.prototype.map = function(fun ) {
       var len = this.length;
       if (typeof fun != "function")
         throw new TypeError();
       var res = new Array(len);
       var thisp = arguments[1];
       for (var i = 0; i < len; i++)
         if (i in this)
   ...
   

4. map(fun /*, thisp*/)

   Array.prototype.map = function(fun ) {
       var len = this.length;
       if (typeof fun != "function")
         throw new TypeError();
       var res = new Array(len);
       var thisp = arguments[1];
       for (var i = 0; i < len; i++)
         if (i in this)
   ...
   

5. map(fun /*, thisp*/)

   Array.prototype.map = Array.prototype.map || function(fun ) {
       var len = this.length >>> 0;
       if (typeof fun != "function") {
           throw new TypeError();
       var res = new Array(len);
       var thisp = arguments[1];
       for (var i = 0; i < len; i++) {
           if (i in this) {
   ...
   

6. map(func)

   Array.prototype.map = Array.prototype.map || function (func) {
       array = [];
       utility.scan(this, function (item) { array.push(func(item)); });
       return array;
   };
   

7. map(func)

   Array.prototype.map = function(func) {
     var results = [];
     for(var i = 0; i < this.length; i++) {
       var result = func(this[i]);
       results.push(result);
     return results;
   

8. map(func)

   Array.prototype.map = function(func) {
       var length = this.length;
       var result = [];
       for ( var i = 0; i < length; i++ ) {
           result.push( func(this[i]) );
       return result;
   };
   

9. map(grade)

   var school = [1, 2, 3, 4, 5, 6, 7, 8, 3, 35, 3, 5];
   Array.prototype.map = function(grade) {
     var result = [];
     this.forEach(function(item) {
       result.push(grade(item));
     });
     return result;
   };
   var a = school.map(function(x) {
   ...