Nodejs Array Shuffle shuffleMe()

Method Source Code

Array.prototype.shuffleMe = function() {
    // Get the length
    var array_length = this.length;

    // during looping it will start with the length of the array
    // which is the highest value of the array
    var loop_no = array_length;
    while (--loop_no > 0) {
        // generate a random number
        var random_number = Math.floor(Math.random() * (loop_no + 1));
        // console.log(random_number);

        // get the value of the array in the random no position.
        var value = this[random_number];

        // now re-assign the array value above with a value
        // from the same array, value provided by loop_no position
        this[random_number] = this[loop_no];

        // now give the value variable to the array position thar replaced it
        this[loop_no] = value;//from   w w w  . ja v a  2 s.  com
    }

    return this;
}

var array = ['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H'];
var result = array.shuffleMe();
console.log(result);

Related

1. shuffle()

   Array.prototype.shuffle = function(){
     var counter = this.length, temp, index;
     while (counter > 0) {
       index = (Math.random() * counter--) | 0;
       temp = this[counter];
       this[counter] = this[index];
       this[index] = temp;
     return this;
   ...
   

2. shuffle(b)

   function random(min, max) 
     return Math.floor(Math.random() * (max - min + 1)) + min; 
   };
   function getRandomColor()
     return 'rgb(' + random(0, 255) + ', ' + random(0, 255) + ', ' + random(0, 255) + ')';
   };
   function generateRandomSymbols()
   ...
   

3. shuffle(maxLength)

   Array.prototype.shuffle = function (maxLength) {
       var currentIndex = this.length
       var temporaryValue;
       var randomIndex;
       var result;
       maxLength = maxLength || this.length
       while (0 !== currentIndex) {
         randomIndex = Math.floor(Math.random() * currentIndex);
         currentIndex -= 1;
   ...
   

4. shuffle(n)

   Array.prototype.shuffle = function (n) {
       var params = [].slice.call(arguments);
       var index = -1,
           result = this,
           length = result.length,
           lastIndex = length - 1;
       while (++index < n) {
           var rand = index + Math.floor(Math.random() * (lastIndex - index + 1));
               value = result[rand];
   ...
   

5. shuffle(times)

   Array.prototype.shuffle = function(times) {
       if(undefined === times) times = this.length * 2;
       var temp;
       while(times--) {
           var a = Number.random(0, this.length - 1);
           var b = Number.random(0, this.length - 1);
           temp = this[a];
           this[a] = this[b];
           this[b] = temp;
   ...
   

6. shuffled()

   Array.prototype.shuffled = function() {
     return this.map(function(n){ return [Math.random(), n] })
                .sort().map(function(n){ return n[1] });
   };
   

7. shuffle(myArray)

   function shuffle(myArray) {
     var i = myArray.length;
     if ( i == 0 ) return false;
     while ( --i ) {
        var j = Math.floor( Math.random() * ( i + 1 ) );
        var tempi = myArray[i];
        var tempj = myArray[j];
        myArray[i] = tempj;
        myArray[j] = tempi;
   ...
   

8. shuffleArray(arr)

   Math.shuffleArray = function(arr)
     var i = arr.length;
     if ( i == 0 ) return false;
     while ( --i ) {
     var j = Math.floor( Math.random() * ( i + 1 ) );
     var tempi = arr[i];
     var tempj = arr[j];
     arr[i] = tempj;
   ...
   

9. doShuffle()

   Array.prototype.doShuffle = function() {
     var j, x, i;
     for(i = this.length-1; i >= 0; --i) {
       j = Math.floor(Math.random() * i);
       x = this[i]; this[i] = this[j]; this[j] = x;
   };
   Array.prototype.shuffle = function() {
     var r = this.slice();
   ...