Nodejs Array First Item first()

Method Source Code

Array.prototype.first = function() {
  if (this[0] !== undefined)
    return this[0]
  else {//  w  w  w . j a  v a2 s.  co  m
    throw new TypeError("Can't get first element of an empty array.")
  }
}

Related

1. first()

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

2. first()

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

3. first()

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

4. first()

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

5. 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());
   

6. first()

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

7. 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
   ...
   

8. first()

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