Nodejs Array Unique Check isUnique(value)

Method Source Code

/**//from   w w  w  . j  a v  a2 s.  co  m
 * Array#isUnique(value) -> Boolean
 * returns true if a specified value is unique in an array 
 * (or if it's not in an array)
 *
 *    [1,2,3].isUnique(1); // true
 *    [1,2,3,1].isUnique(1); // false
 *    [5,6,'a'].isUnique('foo'); // true
 *
 **/
Array.prototype.isUnique = function(value){
  var idx = this.indexOf(value);
  return this.indexOf(value, idx + 1) == -1;
};

Related

1. isUnique()

   "use strict";
   Array.prototype.isUnique = function(){
       var that = this;
       var result = true;
       for (var i = 0; i < that.length; i++){
           for (var j = i+1; j < that.length; j++){
               if(that[i] === that[j]){
                   result = false;
       return result;
   };
   

2. isUnique(obj)

   function rand(min, max){
       min = min || 0;
       max = max || 1;
       return Math.random() * (max - min) + min;
   };
   exports.randInt = function(min, max){
       return Math.floor( rand( min, max ) );
   };
   Array.prototype.isUnique = function(obj){
   ...