Skip to Content
Learning TypeScript 2.x - Second Edition
book

Learning TypeScript 2.x - Second Edition

by Remo H. Jansen
April 2018
Beginner content levelBeginner
536 pages
13h 21m
English
Packt Publishing
Content preview from Learning TypeScript 2.x - Second Edition

Strict property initialization

Since the release of TypeScript 2.7, a compile-time error will be thrown if strict mode is enabled and we forget to initialize one of the properties of a class. For example, the following class initializes the property named height using a method, and the property named width using its constructor. TypeScript knows that if an instance of the class is created, a value will be assigned to the width property. However, it has no way to ensure that a value is assigned to the height property. If strict mode is enabled, an error will be thrown:

class Rectangle { public width: number; public height: number; // Error public constructor(width: number) { this.width = width; } public setHeight(height: number) { this.height ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Start your free trial

You might also like

Mastering TypeScript - Fourth Edition

Mastering TypeScript - Fourth Edition

Nathan Rozentals
Learning TypeScript

Learning TypeScript

Josh Goldberg
TypeScript for Beginners

TypeScript for Beginners

Bharath Thippireddy

Publisher Resources

ISBN: 9781788391474Supplemental Content