Nodejs Array Select select(lambda)

Method Source Code

Array.prototype.select = function(lambda) {
    if (lambda == undefined) {
        return this;
    } else {/*  ww  w.j a  v  a  2s . c  om*/
        result = [];
        for (i = 0; i < this.length; i++) {
            if (lambda(this[i])) {
                result.push(this[i]);
            }
        }
        return result;
    }
};

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;
     }, []);
   

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;
   

6. select(predicate)

   Array.prototype.select = function(predicate){
       var r = []
       for(var n = 0; n < this.length; n++) {
           if(predicate(this[n])){
               r.push(this[n]);
       return r;
   };
   ...
   

7. select(projection)

   Array.prototype.select = function (projection) {
       var results = [];
       for (var i = 0; i < this.length; i++) {
           results.push(projection(this[i]));
       return results;
   };
   var children = [{ id: 1, Name: "Rob" }, { id: 2, Name: "Sansa" }, { id: 3, Name: "Arya" }, { id: 4, Name: "Brandon" }, { id: 5, Name: "Rickon" }];
   var filteredChildren = children.where(function (x) {
   ...
   

8. select(selectFunction)

   Array.prototype.select = function(selectFunction) {
       return this.inject([], function(result, element) {
           if (selectFunction(element)) {
               result.push(element);    
           return result;
       });
   };
   

9. select(selector)

   Array.prototype.select = function (selector) {
       if (selector == null || typeof (selector) !== 'function') throw new Error('selector should');
       var result = [];
       for (var i = 0; i < this.length; i++) {
           result.push(selector(this[i]));
       return result;
   };