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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

Generic types

Generic types can help us avoid using type casting and increase the reusability of our code by allowing us to declare (T) when a function, class, or method is consumed, as opposed to when it is declared:

function deserialize<T>(json: string): T {    return JSON.parse(json) as T;}interface User {    name: string;    age: number;}let user = deserialize<User>(`{"name":"Remo","age":28}`);interface Rectangle {    width: number;    height: number;}let rectangle = deserialize<Rectangle>(`{"width":5,"height":8}`);

The preceding example declares a function named deserialize. The type returned by the function (T) is unknown at the point in which the function is declared. The function is then invoked on two occasions, and the type T becomes finally known ...

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Publisher Resources

ISBN: 9781788391474Supplemental Content