Nodejs Array First Item first()

Method Source Code

Array.prototype.first = function () {
    this.current = 0;/*w w w  .jav  a 2  s. c  o m*/
    // we don't want to touch the array
    return jQuery.extend(true, [], this[this.current]);
};
Array.prototype.last = function () {
    this.current = this.length - 1;
    // we don't want to touch the array
    return jQuery.extend(true, [], this[this.length - 1]);
};
Array.prototype.next = function () {
    this.current = this.current + 1;

    if (this.current === this.length) {
        this.current = 0;
    }

    // we don't want to touch the array
    return jQuery.extend(true, [], this[this.current]);
};
Array.prototype.prev = function () {
    this.current = this.current - 1;

    if (this.current < 0) {
        this.current = this.length - 1;
    }
    // we don't want to touch the array
    return jQuery.extend(true, [], this[this.current]);
};
Array.prototype.current = 0;

Related

1. first()

   Array.prototype.first = function() {
     if (this[0] !== undefined)
       return this[0]
     else {
       throw new TypeError("Can't get first element of an empty array.")
   

2. 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());
   

3. first()

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

4. 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
   ...
   

5. first()

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

6. first()

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

7. first()

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

8. first()

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

9. first()

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