Ways of creating an object in Javascript
Javascript is mainly about objects and primitives. Primitives relates Object via coercion but, Here are some explicit ways of creating objects in Javascript.
Object: literal
Object literal is something wrapped in the curly braces and contain key: value pairs separated by comma, As per new ES6 if key and value are same name ie. writing it only once will also work as key-pair. see the comment in below example.
Object: Function Factory
In above example circle and circle1 has direct association with JS Object and prototype chain and not to createCircle
In JavaScript, any function can return a new object. When it’s not a constructor function or class, it’s called a factory function.
Object: Function Constructor
Unlike Factory function constructor clone and refer same object and use 4 rules of ‘new’ keyword:
1. Creates a brand new empty object
2. *Link that object to another object
3. Call function with ‘this’ set to the newly created object
4.If function does not return an object assume return of ‘this’
Object: Singleton
Single pattern doesn’t not allow object to create multiple instance like constructor. It create single instance like service hence called Singleton
Object: function constructor + prototype
instead of adding property with `this` operator, adding function to referred prototype directly solves this use case.
This directly points constructor object and this methods access through prototype
Object: Using Object.create() method
Constructor property — It is the linkage of Created Object parent through prototype linkage. It does not mean Object has created out of resulted object.
Object: ES6 class syntax
It is same as constructor function with syntactical sugar of class.
