Nodejs Array Unshift unshift()

Method Source Code

Array.prototype.unshift = function(){
   [].splice.apply(this, [0, 0].concat([].slice.apply(arguments)));
   return this.length;
};

Related

1. unshift(data)

   Array.prototype.unshift = function(data) {
     for(var i = this.length; i > 0; i--) {
       this[i] = this[i-1];
     this[0] = data;
     return this.length;
   };
   

2. unshift(elem)

   Array.prototype.unshift = function(elem) {
     for (var i = this.length; i > 0; i--) {
       this[i] = this[i - 1];
     this[0] = elem;
     return ++this.length;
   };
   

3. unshiftMe(num)

   Array.prototype.unshiftMe = function (num) {
     this[this.length] = this[this.length-1];
     for (var i = this.length-1; i >= 1; i--) {
       this[i] = this[i-1];
     this[0] = num;
     return this.length;
   

4. unshiftRange(arr)

   Array.prototype.unshiftRange = function(arr) {
       this.unshift.apply(this, arr);
   };