June 2013
Beginner
482 pages
11h 16m
English
Content preview from JavaScript Step by StepBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Chapter 7. Working with functions
After reading this chapter, you’ll be able to
Understand the purpose of functions in JavaScript.
Define your own functions.
Call functions and receive data back from them.
Understand some of the built-in functions in JavaScript.
What’s in a function?
A JavaScript function is a collection of statements, either named or unnamed (anonymous), that can be called from elsewhere within a JavaScript program. Functions can accept arguments, which are input values passed into the function. Within a function, those arguments passed into the function can be acted upon and the results returned to the caller of the function via a return value.
Functions are perfect when you have something that needs to happen multiple times within ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.