Nodejs Array Select selectMany(selector, resSelector)

Method Source Code

Array.prototype.selectMany = function (selector, resSelector) {
   resSelector = resSelector || function (i, res) { return res; };
   return this.aggregate(function (a, b) {
      return a.concat(selector(b).select(function (res) { return resSelector(b, res) }));
   }, []);// w  ww  .j  ava 2s  . co m
};

Related

1. select(selectFunction)

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

2. 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;
   };
   

3. select(selector, context)

   Array.prototype.select = Array.prototype.map || function (selector, context) {
     context = context || window;
     var arr = [];
     var l = this.length;
     for (var i = 0; i < l; i++)
       arr.push(selector.call(context, this[i], i, this));
     return arr;
   };
   

4. select(transformer)

   Array.prototype.select = function(transformer) {
       if (typeof(transformer) != "function") {
           throw new Error("The argument must be a function");
       var arr = [];
       for (var i = this.length - 1; i >= 0; i--) {
           arr[i] = transformer(this[i]);
       return arr;
   ...
   

5. selectMany(fn)

   let src = [
       [1, 2, 3, 4],
       [2, 7, 8, 9],
       [1, 2, 3, 4],
   ];
   let src1 = [1, 123, 567];
   Array.prototype.selectMany = function(fn) {
       let resultArray = [];
       let result = [];
   ...
   

6. selectObjects(key, array)

   Array.prototype.selectObjects = function(key, array){
     var toReturn = []
     $.each(this, function(i, object){
       if(array.indexOf(object[key]) > -1){
         toReturn.push(object)
     })
     return toReturn
   

7. selectOne(filter)

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

8. selectRandom()

   var alphabet = "aabcdeefghiijklmnoopqrstuuvwxyyz";
   function randint(min, max) {
       return Math.floor(Math.random() * (max - min)) + min;
   Array.prototype.selectRandom = function() {
       return this[randint(0, this.length)];
   };
   function random_word(min, max) {
       var word = "";
   ...
   

9. selects(cond)

   Array.prototype.selects = function (cond) {
     var results = [];
     this.forEach(function (el) {
       if (cond(el)) {
         results.push(el);
     });
     return results