Prototype extension implementation code for local object Array

=function(){
var b={},c,i=0,l=,j;
for(;i<l;i++){
c=();
c in b ? b[c]++ : b[c]=0;
}
for(j in b){
if(b[j]>0)(+j||j);
}
return this;
}
var a=[1,2,2,3,3,3,'a','b','b'];
alert(());