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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

Local types

The TypeScript type system allows us to declare types (such as type aliases, classes, and interfaces) within the declaration of functions and methods. In the early releases of TypeScript, this was not allowed:

interface Person {    name: string;    age: number;}function makePerson(name: string, age: number): Person {    // Local type    class Person implements Person {        constructor(            public name: string,            public age: number        ) {}    }    return new Person(name, age);}let user = makePerson("Remo", 28);
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Publisher Resources

ISBN: 9781788391474Supplemental Content