Nodejs Array Filter filter(fn, context)

Method Source Code

Array.prototype.filter = function(fn, context) {
  if (typeof fn != "function") {
    throw new TypeError(fn + " is not a function");
  }//from   w ww  .ja va2  s  .  co m

  if (typeof context === 'undefined') {
    context = this;
  }

  var res = [];
  for (var i = 0, l = this.length; i < l; ++i) {
    if (this.hasOwnProperty(i)) {
      if (fn.call(context, this[i], i, this)) {
        res.push(this[i]);
      }
    }
  }

  return res;
}

Related

1. filter(f)

   Array.prototype.filter = function(f) {
     var filtered = [];
       for(var i = 0; i < this.length; i++)
         f(this[i], i) && filtered.push(this[i]);
       return filtered;
   };
   

2. filter(f)

   Array.prototype.filter = function(f) {
     var filter = [];
     for (var i = 0; i < this.length; i++) {
       if (f(this[i]))
         filter.push(this[i]);
     return filter;
   };
   

3. filter(filterFunc)

   Array.prototype.filter = function(filterFunc) {
     var ret = [];
     for(var i = 0; i < this.length; i++) {
       if(filterFunc(this[i])) {
         ret.push(this[i]);
     return ret;
   };
   ...
   

4. filter(fn)

   Array.prototype.filter = function(fn){
       var self = this;
       var arr = [];
       for(var i=0; i<self.length; i++){
           if (fn(self[i])){
               arr.push(self[i]);
       return arr;
   ...
   

5. filter(fn)

   Array.prototype.filter = function(fn)
       r = [];
       this.forEach(function (item) { if (fn(item)) r.push(item); });
       return r;
   

6. filter(fun /*, thisArg */)

   "use strict";
   Array.isArray = function(arg) {
       return Object.prototype.toString.call(arg) === '[object Array]';
   };
   Array.prototype.filter = function(fun ) {
       if (this === void 0 || this === null)
           throw new TypeError();
       var t = Object(this);
       var len = t.length >>> 0;
   ...
   

7. filter(fun /*, thisp */)

   Array.prototype.filter = Array.prototype.filter || function(fun ) {
     "use strict";
     if (this === void 0 || this === null) throw new TypeError();
     var t = Object(this);
     var len = t.length >>> 0;
     if (typeof fun !== "function") throw new TypeError();
     var res = [];
     var thisp = arguments[1];
     for (var i = 0; i < len; i++) {
   ...
   

8. filter(fun /*, thisp*/)

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

9. filter(fun)

   "use strict";
   Array.prototype.filter = function (fun) {
       let filtered = [];
       for (let i = 0; i < this.length; i++) {
           if (fun(this[i])) {
               filtered.push(this[i]);
       return filtered;
   ...