Nodejs Array Extract extract(field)

Method Source Code

/**/*w  w w. ja v a 2  s  . c o  m*/
 * Extracts a new array from the czrent one, iterating over the objects in the array, extracting the field
 * 
 * @param String the name of the field 
 * @return Returns a new array containing only the fields (if defined) with the given name of objects in this array
 */
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;
};

Related

1. extract(attribute)

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

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]);
   ...