devpeds

/* 1. Class Constant : Lazy initialization is supported. Officially recommanded way */

class Singleton {
    static let shared = Singleton()
    private init() { } // prevent creating another instances.
}

/* 2. Nested Struct : Workaround for the lack of static class constants in Swift 1.1 and earlier. still useful 
in functions, where static constants and varialbles cannot be used. */

devpeds

/* 1. Class Constant : Lazy initialization is supported. Officially recommanded way */

class Singleton {
    static let shared = Singleton()
    private init() { } // prevent creating another instances.
}

/* 2. Nested Struct : Workaround for the lack of static class constants in Swift 1.1 and earlier. still useful 
in functions, where static constants and varialbles cannot be used. */

devpeds

// Node
var Node = function(key) {
  this.key = key;
  this.parent = null;
  this.right = null;
  this.left = null;
}

Node.prototype = {
  getKey: function() { return this.key; }

devpeds

// Node
var Node = function(key) {
  this.key = key;
  this.next = null;
};

Node.prototype = {
  getKey: function() { return this.key; }
  ,
  getNext: function() { return this.next; }

devpeds

// Node
var Node = function(key) {
  this.key = key;
  this.next = null;
  this.prev = null;
};

Node.prototype = {
  getKey: function() { return this.key; }
  ,

devpeds

// Node
var Node = function(key) {
  this.key = key;
  this.next = null;
};

Node.prototype = {
  getKey: function() { return this.key; }
  ,
  getNext: function() { return this.next; }

devpeds

var Deque = function() {
    this.arr = [];
};

Deque.prototype.size = function() {
    return this.arr.length;
};

Deque.prototype.empty = function() {
    return this.size() === 0;

devpeds

var Queue = function() {
  this.data = [];
};

Queue.prototype.size = function() {
  return this.data.length;
}

Queue.prototype.empty = function() {
  return this.size() === 0;

devpeds

var Stack = function() {
  this.data = [];
};

Stack.prototype.size = function() {
  return this.data.length;
};

Stack.prototype.empty = function() {
  return this.size() === 0;