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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

Higher-order functions

A higher-order function is a function that does at least one of the following:

  • Takes one or more functions as arguments
  • Returns a function as its result

Higher-order functions are one of the most powerful tools that we can use to write JavaScript in an FP style. Let's see some examples.

The following code snippet declares a function named addDelay. The function creates a new function that waits a given number of microseconds before printing a message in the console. The function is considered a higher-order function because it takes a function as one of its arguments:

function addDelay(msg: string, ms: number) { return () => { setTimeout(() => { console.log(msg); }, ms); }; } const delayedSayHello = addDelay("Hello ...
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Publisher Resources

ISBN: 9781788391474Supplemental Content