Nodejs Array Random random(i)

Method Source Code

// somehow this should be within a other module
// without the use of protoype
Array.prototype.random = function(i) {
    var random = [];
    for(; i > 0;) {
        random.push(this[Math.random() * this.length | 0]);
        i--;//from ww w .  j  a v  a2  s. c o m
    }
    return random;
};

var usedNames = {};
module.exports = function() {
    var self = {};
    var initName = function() {
        var newName;
        do {
            newName = "ABCDEFGHIJKLMNOPQRSTUVWXYZ".split('').random(2).join('') +  "01234556789".split('').random(3).join(''); 
        } while (typeof usedNames[newName] !== 'undefined');
        usedNames[newName] = true;
        return newName;
    };
    var name = initName();

    var reset = function() {
        self.name = initName();
    };

    self = {
        name  : name,
        reset : reset
    };

    return self;
};

Related

1. random()

   window.console = window.console || {'log':function(){}}
   function randomInt(min, max) {
     return Math.floor(Math.random() * (max - min + 1)) + min;
   Array.prototype.random = function () {
     return this[Math.random() * this.length - 1 | 0];
   };
   Array.prototype.subRandom = function () {
     var length = randomInt(0, this.length)
   ...
   

2. random()

   Array.prototype.random = function() {
     return this[Math.floor(Math.random() * this.length)];
   Number.prototype.toPrice = function() {
     return this.valueOf().toFixed(2).replace(/./g, function(c, i, a) {
       return i && c !== "." && !((a.length - i) % 3) ? "," + c : c;
     });
   

3. random()

   Array.prototype.random = function(){
     return this[Math.round(Math.random()*(this.length-1))]
   

4. random()

   Array.prototype.random = function()
     return this[Random(0, this.length - 1)];
   

5. random()

   Array.prototype.random = function() {
     if (this.length == 0) return void 0;
     return this[Math.floor(Math.random() * this.length)];
   };
   

6. random(last)

   Array.prototype.random = function(last) {
       var num = 0;
       do {
          num = Math.floor(Math.random() * this.length);
       } while (this[num] == last);
       return this[num];
   

7. random(nelm)

   Array.prototype.random = function(nelm) {
     nelm = nelm || 1;
     if (nelm <= 0) {
       nelm = 1;
     if (nelm === 1) {
       return this[Math.floor(Math.random() * this.length)];
     var ret = [], i;
   ...
   

8. random(num, enableDuplicate)

   Array.prototype.random = function(num, enableDuplicate){
     var array = [];
     var duplicate;
     if(typeof duplicate === "undefined"){
       duplicate = false;
     else{
       duplicate = enableDuplicate;
     if(num <= this.length){
       var index;
       for(var i=0; i<num; i++){
         index = Math.floor(Math.random()*this.length);
         array.push(this[index]); 
         if(!enableDuplicate){
           this.splice(index, 1);
       return array;
   module.exports = Array;
   

9. randomElement()

   Array.prototype.randomElement = function () {
       return this[Math.floor(Math.random() * this.length)]