function duplicates(arr) {     var temp = [];     arr.forEach(function(elem){         if(arr.indexOf(elem) != arr.lastIndexOf(elem) && temp.indexOf(elem) == ...

function insert(arr, item, index) { var temp = arr.slice(0); temp.splice(index,0,item); return temp; /* var temp = [],res = []; temp.push(arr.slice(0,index)); res.push(arr.slice(index)); temp.push(item); return temp.concat(res); */}

function NumberOf1(n) {     var count = 0;     while(n != 0){         count++;         n = n&(n-1);     }     return count; }

function isAvailableEmail(sEmail) {     var reg = /^([\w+\.])+@\w+([.]\w+)+$/;     return reg.test(sEmail); }

Array.prototype.uniq = function () {          var temp = [];     var flag = true;          for( var i = 0;i < this.length;i++ ){         if(temp.indexOf(this[i])==-1){             if( this[i] != this[i] ){                 if(flag){                     temp.push(this[i]);                     flag ...