Classes, Inheritance and Static members in #JavaScript #ES6
Class definition syntax and Class Constructor
Classes, Inheritance and Static members in #JavaScript #ES6
Class definition syntax and Class Constructor
So first things first; The constructor, which sets up each instance’s initial state and handles any parameters that were passed when calling new.
Just like other object oriented languages Constructor is defined in a class block and is constructor, though it’s actually handled as a special case.
Note is that a class constructor cannot be made static in JavaScript via the static keyword, but you can make class members as static using the keyword.
Class Inheritance in JavaScript
Inheritance is also very similar to other object-oriented languages:
methods defined on the base are accessible in the child class.
If the child class declares its own constructor then it must invoke the parents constructor via super() before it can access this.
Static Methods in JavaScript
Static methods and properties are defined on the class/constructor itself, not on instance objects. These are specified in a class definition by using the static keyword.
Repeat after me…
- Support for “class” was only added to JavaScript as part of the 2015 ES6 standard.
- JavaScript classes are just wrappers around JavaScript’s already existing prototype-based inheritance.
- This new syntax is not a new implementation in JavaScript that handles inheritance in JavaScript, and it is just a simpler syntax to do the same thing that we used to do with prototypes.
