Nodejs Array Select select(fields)

Method Source Code

Array.prototype.select = function (fields) {
    return this.map(function (i) {
        var res = {};
        fields.forEach(function (f) {
            res[f] = i[f];// ww  w .  j a va2s.c  om
        });
        return res;
    });
};

Related

1. select(f)

   Array.prototype.select = function(f){
     var newArray = [];
     var temp = '';
     for(var i = 0; i < this.length; i++){
        temp = f(this[i]);
         if(temp != null || temp!= undefined){
             newArray.push(temp);
     return newArray;
   };
   

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;
     }, []);
   

5. select(func)

   Array.prototype.select = function (func) {
       var length = this.length,
           items = [];
       for (var i = 0; i < length; i++) {
           items.push(func(this[i]));
       return items;