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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

Weak types

A weak type is an object literal type in which all properties are optional:

interface User {    name?: string;    age?: number;}

TypeScript allows us to add a value with some or all the properties defined in the weak type, but it doesn't allow us to assign properties that are not part of the weak type:

let user1: User  = { name: "Remo", age: 28 }; // OKlet user2: User = { firstName: "Remo", yearBorn: 28 }; // Error
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Publisher Resources

ISBN: 9781788391474Supplemental Content