Nodejs Array Duplicate duplicate()

Method Source Code

Array.prototype.duplicate = function(){
  var newArr = this.slice();
  for(var i = 0; i < this.length; i ++){
    newArr.push(this[i]);/*from w  w  w.j a v  a  2s  .co  m*/
  }
  return newArr;
};

console.log([1, 2, 3, 4].duplicate());

Related

1. duplicate()

   Array.prototype.duplicate = function() {
       return (this + ',' + this);
   };
   

2. duplicate()

   Array.prototype.duplicate = function(){
     return this.concat(this);
   duplicate([1,2,3,4,5])
   

3. duplicate()

   function duplicateArray(arr) {
     return arr.concat(arr);
   Array.prototype.duplicate = function() {
     return this.concat(this);
   console.log([1,2,3,4,5].duplicate());
   console.log(duplicateArray([1,2,3,4,5]));
   

4. duplicate()

   Array.prototype.duplicate = function(){
     var arrayVal = this;
     this.forEach(function(val){
       arrayVal.push(val);
     })
     return arrayVal;
   

5. duplicate()

   var arr1 = [3, 'a', 'a', 'a', 2, 3, 'a', 3, 'a', 2, 4, 9, 3];
   Array.prototype.duplicate = function () {
       return this.concat(this);
   console.log([4, 5, 6, 7, 7].duplicate());