Nodejs Array Extract extract(attribute)

Method Source Code

"use strict";//w w w  .j  a  v  a  2s  .co m

Array.prototype.extract = function(attribute) {
   var newArr = [];
   
   for (var i = 0; i < this.length; i++) {
      newArr.push(this[i][attribute]);
   }
   
   return newArr;
}

Related

1. extract(field)

   Array.prototype.extract = function(field) {
     var newArray = [];
     for (var i = 0; i < this.length; i++) {
       if (this[i][field] != undefined) {
         newArray.push(this[i][field]);
     return newArray;
   };
   ...
   

2. extract(predicate)

   Array.prototype.extract = function(predicate) {
       var removed = [];
       if (this.length===0 || !predicate || typeof predicate !== 'function') {
       return removed;
       var idx = 0;
       while(idx < this.length) {
           if (predicate(this[idx])) {
               removed.push(this[idx]);
   ...