Nodejs Array Select select(f)

Method Source Code

Array.prototype.select = function(f){
  var newArray = [];
  var temp = '';

  for(var i = 0; i < this.length; i++){
     temp = f(this[i]);/*from ww w . ja  va  2s  .c  o m*/
      if(temp != null || temp!= undefined){
          newArray.push(temp);
      }
  }
  return newArray;
};

Related

1. select(fields)

   Array.prototype.select = function (fields) {
       return this.map(function (i) {
           var res = {};
           fields.forEach(function (f) {
               res[f] = i[f];
           });
           return res;
       });
   };
   ...
   

2. select(filter)

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

3. select(fnCallback)

   Array.prototype.select = function(fnCallback) {
       var value = Array();
       for (var elementIndex in this) {
           if (this.hasOwnProperty(elementIndex)) {
               value.push(fnCallback.apply(this[elementIndex], [elementIndex]));
       return value;
   };
   ...
   

4. select(fun)

   Array.prototype.select = function(fun) {
     return this.reduce(function(res, el) {
       if(fun(el)) {
         res.push(el);
       };
       return res;
     }, []);