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Using Classes in JavaScript
Classes in JavaScript are a special syntax for its prototypical inheritance model that is a comparable inheritance in class-based object oriented languages. Classes are just special functions added to ES6 that are meant to mimic the class keyword from these other languages. In JavaScript, we can have class declarations and class expressions, because they are just functions. So like all other functions, there are function declarations and function expressions.
Classes serve as templates to create new objects.
The most important thing to remember: Classes are just normal JavaScript functions and could be completely replicated without using the class syntax. It is special syntactic sugar added in ES6 to make it easier to declare and inherit complex objects.
Defining Classes
To declare a class, we use the class keyword. For example, to declare a simple class, we can write:
class Person{
constructor(firstName, lastName) {
this.firstName= firstName;
this.lastName = lastName;
}
}Class declarations aren’t hoisted so they can’t be used before they are defined in the code, as the JavaScript interpreter will not automatically pull them up to the top. So the class above won’t work before it’s defined in the code like the following:
