Nodejs Array Shift shift()

Method Source Code

//array.shift()//from  w w  w .  ja v a2s  . c om
var a = ['a', 'b', 'c'];
var c = a.shift(); //
console.log('a : ' + a); // b,c
console.log('c : ' + c); // a

//shift can be implemented like this.
//The splice() method adds/removes items to/from an array, and returns the removed item(s).
//array.splice(start,deleteCount,item..)

Array.prototype.shift = function () {
    return this.splice(0, 1)[0];
};

var d = ['a', 'b', 'c'];
var e = d.shift(); // a
console.log('e : ' + e); // a
console.log('d : ' + d); // a

Related

1. shift()

   Array.prototype.shift = function () {
      return this.splice(0, 1)[0];
   };
   

2. shift()

   Array.prototype.shift = function() {
     var elem = this[0];
     for (var i = 0, len = this.length; i < len - 1; i++) {
       this[i] = this[i + 1];
     delete this[--this.length];
     return elem;
   };
   

3. shift()

   Array.prototype.shift = function () {
       var firstUnit = this[0];
       for (var i = 0; i < this.length; i++)
           this[i] = this[i+1];
       this.pop();
       return firstUnit;
   

4. shift()

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

5. shiftMe()

   Array.prototype.shiftMe = function () {
     var shifted = this[0];
     for (var i = 1; i < this.length; i++) {
       this[i-1] = this[i];
     this.splice(-1,1);
     return shifted;