- Constructor
// This creates a new empty Object
var newObject = {};
// This creates a new empty Object
var newObject = Object.create(Object.prototype);
var newObject = new Object();
- Prototype
var myCar = {
name: "Ford Escort",
brake: function() {
console.log("Stop! I am applying brakes");
}
Panic : function() {
console.log ( "wait. how do you stop thuis thing?")
}
}
var yourCar= Object.create(myCar);
// You can now see that one is a prototype of the other
console.log(yourCar.name);
- Module
function AnimalContainter (){
const container = [];
function addAnimal (name) {
container.push(name);
}
function getAllAnimals() {
return container;
}
function removeAnimal(name) {
const index = container.indexOf(name);
if(index < 1) {
throw new Error('Animal not found in container');
}
container.splice(index, 1)
}
return {
add: addAnimal,
get: getAllAnimals,
remove: removeAnimal
}
}
const container = AnimalContainter();
container.add('Hen');
container.add('Goat');
container.add('Sheep');
console.log(container.get()) //Array(3) ["Hen", "Goat", "Sheep"]
container.remove('Sheep')
console.log(container.get()); //Array(2) ["Hen", "Goat"]
- Singleton
function DatabaseConnection () {
let databaseInstance = null;
// tracks the number of instances created at a certain time
let count = 0;
function init() {
console.log(`Opening database #${count + 1}`);
//now perform operation
}
function createIntance() {
if(databaseInstance == null) {
databaseInstance = init();
}
return databaseInstance;
}
function closeIntance() {
console.log('closing database');
databaseInstance = null;
}
return {
open: createIntance,
close: closeIntance
}
}
const database = DatabseConnection();
database.open(); //Open database #1
database.open(); //Open database #1
database.open(); //Open database #1
database.close(); //close database
- Factory
- Observer
- Command
