Nodejs Array Shift shift()

Method Source Code

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

Related

1. 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;
   };
   

2. 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;
   

3. shift()

   var a = ['a', 'b', 'c'];
   var c = a.shift(); 
   console.log('a : ' + a); 
   console.log('c : ' + c); 
   Array.prototype.shift = function () {
       return this.splice(0, 1)[0];
   };
   var d = ['a', 'b', 'c'];
   var e = d.shift(); 
   ...
   

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];
   };