JavaScript Function Constructor - JavaScript Video Tutorial | JavaScript Video for Beginner Tutorial
JavaScript Function Constructor - JavaScript Video Tutorial | JavaScript Video for Beginner Tutorial
#JavaScriptFunctionConstructor #JavaScriptConstructor #JavaScriptTutorial
JavaScript Function Constructor
Constructors are like regular functions, but we use them with the "new" keyword. There are two types of constructors: native (aka built-in) constructors like Array and Object, which are available automatically in the execution environment at runtime; and custom constructors, which define properties and methods for your own type of object.
A constructor is useful when you want to create multiple similar objects with the same properties and methods. It’s a convention to capitalize the name of constructors to distinguish them from regular functions. Consider the following code:
function Book() { // unfinished code } var myBook = new Book();
this keyword
The value of this, when used in an object, is the object itself.
In a constructor function, this does not have a value. It is a substitute for the new object. The value of this will become the new object when a new object is created.
Object Prototype Chain
All JavaScript objects inherit properties and methods from a prototype. A prototype is an object that is associated with every functions and object by default in JavaScript, where function's prototype property is accessible and modifiable and object's prototype property (aka attribute) is not visible.
JavaScript object has a prototype property, which makes inheritance possible in JavaScript
The prototype property of an object is where we put methods and properties that we want other objects to inherit.
The Constructor’s prototype property is NOT the prototype of Constructor itself, it’s the prototype of ALL instances that are created through it;
When a certain method is called the search start in the object itself, and if it cannot be found, the search moves on to the object’s prototype.
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