Nodejs Array Select selectRandom()

Method Source Code

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 = "";
    var length = randint(min, max);
    for (var i=0; i<length; i++) {
        word += alphabet.charAt(randint(0, alphabet.length));
    }/*from  w  ww . ja  va  2  s .  c  om*/
    return word;
}

Related

1. 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;
   ...
   

2. 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 = [];
   ...
   

3. selectMany(selector, resSelector)

   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) }));
     }, []);
   };
   

4. 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
   

5. selectOne(filter)

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

6. selects(cond)

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