Nodejs Array Filter filter(fun, thisp)

Method Source Code

/**//from ww w  . j a  v  a  2s.c om
 * Array.prototype.filter Polyfill
 */

Array.prototype.filter = function(fun, thisp) {
   "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 = [ ];
   for (var i = 0; i < len; i++) {
      if (i in t) {
         var val = t[i]; // in case fun mutates this
         if (fun.call(thisp, val, i, t)) {
            res.push(val);
         }
      }
   }
   return res;
};

/* End of file filter.js */

Related

1. 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) {
   ...
   

2. 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;
   ...
   

3. filter(fun)

   "use strict";
   Array.prototype.filter = function (fun) {
       let arr = [];
       let thisArg = arguments.length >= 2 ? arguments[1] : void 0;
       for (let i = 0; i < this.length; i++) {
           if (fun.call(thisArg, this[i], i, this)) {
               arr.push(this[i]);
       return arr;
   

4. filter(fun)

   Array.prototype.filter = function (fun) {
       var len = this.length;
       var res = [];
       var thisArg = void 0;
       for (var i = 0; i < len; i++) {
           var val = this[i];
           if (fun.call(thisArg, val)) {
               res.push(val);
       return res;
   };
   

5. filter(fun)

   Array.prototype.filter = function(fun) {
     "use strict";
     var i, len, res, t, thisArg, val;
     if (this === void 0 || this === null) {
       throw new TypeError();
     t = Object(this);
     len = t.length >>> 0;
     if (typeof fun !== "function") {
   ...
   

6. filter(func)

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

7. filter(grade)

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

8. filter(isOk)

   const array = [1, 42, 7, 9, 13, 10, 20, 35, 45, -7, -3, 0, 4, -1, 15];
   Array.prototype.filter = function (isOk) {
     let filteredArray = [];
     const len = this.length;
     for (let i = 0; i < len; i += 1) {
       if(isOk(this[i], i, this)) {
         filteredArray.push(this[i]);
     return filteredArray;
   };
   

9. filter(iterator)

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