JavaScript Classes

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Revision as of 22:50, 21 January 2020 by Ovidiu (talk | contribs) (→‎Overview)
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Overview

A JavaScript class is a syntactical superstructure in top of the language's existing prototype-based inheritance, and it does not introduce a new object-oriented inheritance model in JavaScript. A class is a special function, so like in the functions' case, a class syntax has two components: declarations and expressions. An important difference between function declaration and class declaration is that function declaration and hoisted, while the class declarations are not: you first need to declare the class and then access it, otherwise a ReferenceError is thrown.

Declaration

Use the class keyword:

class Simplest {
  constructor(content) {
    this.content = content;
  }
}

Class Expression