Nodejs Array First Item first()

Method Source Code

// get array first element

Array.prototype.first = function () {
    return this[0];
};

Related

1. first()

   "use strict";
   Array.prototype.first = function  () {
     if (this.length === 0) {
       throw "Empty string doesn't have first element";
     return this[0];
   };
   console.log(["a", "b", 3].first());
   

2. first()

   Array.prototype.first = function () {
       return this[0];
   };
   

3. first()

   var dict = { path: 24, montes:23, mike: 37, andrea: 21}
   var friends = []
   for (var name in dict) {
     friends.push(name + ":" + dict[name])
   console.log(friends)
   var dictAux = {}
   dictAux.alice = 34
   dictAux.bob = 4
   ...
   

4. first()

   Array.prototype.first = function(){
       if (this.length > 0)
           return this[0];
       else
           return [];
   

5. first()

   Array.prototype.first = function () {
       this.current = 0;
       return jQuery.extend(true, [], this[this.current]);
   };
   Array.prototype.last = function () {
       this.current = this.length - 1;
       return jQuery.extend(true, [], this[this.length - 1]);
   };
   Array.prototype.next = function () {
   ...
   

6. first()

   Array.prototype.first = function() {
     return this[0];
   Array.prototype.last = function() {
     return this[this.length-1];
   

7. first()

   Array.prototype.first = function() {
     return this[0];
   

8. first()

   Array.prototype.first = function() {
       if (this.isEmpty()) {
           return null;
       return this[0];
   };
   

9. first()

   Array.prototype.first = function() {
       if (this.length == 0) return null
       return this.slice(0)[0]