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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

Function overloading

Function overloading, or method overloading, is the ability to create multiple methods with the same name and a different number of parameters or types. In TypeScript, we can overload a function by specifying all function signatures (known as the overload signatures) of a function, followed by a signature (known as the implementation signature). Let's look at an example:

function test(name: string): string; // overloaded signature function test(age: number): string; // overloaded signature function test(single: boolean): string; // overloaded signature function test(value: (string|number|boolean)): string { // implementation signature switch (typeof value) { case "string": return `My name is ${value}.`; case "number": ...
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Publisher Resources

ISBN: 9781788391474Supplemental Content