Several Methods for de-duplicating Javascript Arrays

Method 1: extract JQ (source network). This method is complete.

Array.prototype.unique = function(){    var results=this.sort()    for ( var i = 1; i < results.length; i++ ) {        if ( results[i] === results[ i - 1 ] ) {            results.splice( i--, 1 );        }    }    return results;}

 

Method 2: complete method.

       Array.prototype.unique = function(){         var newArray = [],          temp = {};            for(var i = 0; i < this.length; i++){                temp[typeof(this[i])+this[i]] = this[i];            }            for(var j in temp){                newArray.push(temp[j]);            }            return newArray;        };

Method 3, incomplete.

Array.prototype.contains = function(item){ return RegExp( "\\b"+item+"\\b").test(this);};Array.prototype.unique = function(){    var returnArr = [];   for ( var i = 0 , len = this.length; i < len; i++){      if( !returnArr.contains(this[i]) ) returnArr.push(this[i]);   }   return returnArr;}

 

Why do we say the first two are complete, because there is no such bug: ['1', 1] => 1.