Array deduplication Array, Array deduplication Array

Array deduplication Array, Array deduplication Array

var aee3=[31,42,13,19,5,11,8,13,40,39,1,8,44,15,3];        Array.prototype.unqu2=function(){          this.sort();          var arr2=[this[0]];          for (var j = 1; j < this.length; j++) {               if(this[j]!=arr2[arr2.length-1]){                   arr2.push(this[j]);              }           };           return arr2;        }         Array.prototype.unqu3=function(){            var arr=[];            lable:for (var i = 0; i < this.length; i++) {                for (var j = 0; j < arr.length; j++) {                  if(this[i]==arr[j]){                       continue lable;                  }                };                arr[arr.length]=this[i];            };            return arr;        }                    Array.prototype.unqu=function(){            var n={},arr2=[];               for (var i = 0; i < this.length; i++) {                 if(!n[this[i]]){                     n[this[i]]=true;                     arr2.push(this[i]);                  }               };                  return arr2;         }         console.log(aee3.unqu());

There are a lot of de-duplication methods on the Internet, and the most stupid is the second method, and the best efficiency is the third one.