November 2019
Beginner
804 pages
20h 1m
English
Content preview from Learn TypeScript 3 by Building Web Applications
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JavaScript and OOP
In JavaScript, the concept of classes did not exist before ES2015. Inheritance in JavaScript is based on the prototype chain; we say that JavaScript uses prototypal inheritance.
Also, the class keyword added by ES2015 is actually only syntactic sugar around the usage of prototypes—it does not really introduce a new inheritance mechanism!
JavaScript has no notion of interfaces, and, as a matter of fact, TypeScript interfaces are actually never converted to JavaScript—they simply disappear.
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