Nodejs Array Random random()

Method Source Code

window.console = window.console || {'log':function(){}}

//random int between min (included) and max (included)
function randomInt(min, max) {
   return Math.floor(Math.random() * (max - min + 1)) + min;
}

//get random element from array
Array.prototype.random = function () {
   return this[Math.random() * this.length - 1 | 0];
};

///*w w w . j  av a  2  s . c  o  m*/
Array.prototype.subRandom = function () {
   var length = randomInt(0, this.length)
   var subArray = []
   for (i=0; i<length; i++) {
      subArray.push(this.random())
   }
   return _.uniq(subArray);
};



//unorder array
Array.prototype.shuffle = function () {
   for (var i = this.length; i > 0; --i)
      this.push(this.splice(Math.random() * i | 0, 1)[0]);
   return this;
};

//Add composition. see http://scott.sauyet.com/Javascript/Talk/Compose/2013-05-22/#slide-15
Function.prototype.compose = function(g) {
   var fn = this;
   return function() {
      return fn.call(this, g.apply(this, arguments));
   };
};

Related

1. random()

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

2. random()

   function XHR(method, path, data, callback) {
     var xhr = new XMLHttpRequest();
     xhr.open(method, path, true);
     xhr.onreadystatechange = function() {
       if (xhr.readyState != 4) return;
       callback(xhr.status, xhr.responseText);
     xhr.send(data);
   function getPos(obj) {
     var curleft = 0, curtop = 0;
     if (obj.offsetParent)
       do {
         curleft += obj.offsetLeft;
         curtop += obj.offsetTop;
       } while (obj = obj.offsetParent);
     return {x: curleft, y: curtop};
   function toRangeOrMiddle(a, x ,b) {
     if (b < a) return (a+b)/2;
     if (x < a) return a;
     if (x > b) return b;
     return x;
   Array.prototype.random = function() {
     return this[Math.random()*this.length|0];
   window.onerror = function(errorMsg, url, lineNumber) {
     var msg = "Error happened on <"+url+
       "\n> on line "+lineNumber+":\n"+
       errorMsg;
     console.log(msg);
   

3. random()

   Math.randomInt = function (min, max) {
       return Math.round(Math.random() * (max - min) + min);
   };
   Array.prototype.random = function () {
       this[Math.randomInt(0, this.length-1)];
   

4. random()

   Array.prototype.random = function () { return (this[(Math.max(Math.random() * this.length - 1, 0).toFixed())]) } 
   Array.prototype.fillNull = function(){this[].fill(function(){return null})}
   Array.prototype.bool = function () { return this.map(function (v) { return v ? true : false }) } 
   Array.prototype.a01 = function () { return this.map(function (v) { return v ? 1 : 0 }) }
   Array.prototype.splitToChunks = function (num) {
     var ret = []
     for (var i = 0; i < this.length / num; i++) {
       ret.push(this.slice(i * num, i * num + num))
     return ret
   Array.prototype.removeByIndex = function (index) {
     return this.splice(index, 1)
   Math.myRandom = function (max, min) {
     if(max == undefined) return Math.random()
     if(min == undefined) return Math.random() * max;
     return Math.random() * (max+-min) + min;
   

5. random()

   Array.prototype.random = function () {
     var i, j, k, ti, tj;
     for (k = 0; k < this.length; k++) {
       i = this.length;
       while (--i) {
         j = Math.floor(Math.random() * (i - 1));
         ti = this[i];
         tj = this[j];
         this[j] = ti;
   ...
   

6. 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;
     });
   

7. random()

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

8. random()

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

9. random()

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