August 2016
Intermediate to advanced
635 pages
14h 5m
English
book
JavaScript: Functional Programming for JavaScript Developers
by Ved Antani, Simon Timms, Dan Mantyla
Content preview from JavaScript: Functional Programming for JavaScript DevelopersBecome 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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Scoping
For beginners, JavaScript scoping is slightly confusing. These concepts may seem straightforward; however, they are not. Some important subtleties exist that must be understood in order to master the concept. So what is Scope? In JavaScript, scope refers to the current context of code.
A variable's scope is the context in which the variable exists. The scope specifies from where you can access a variable and whether you have access to the variable in that context. Scopes can be globally or locally defined.
Global scope
Any variable that you declare is by default defined in global scope. This is one of the most annoying language design decisions taken in JavaScript. As a global variable is visible in all other scopes, a global variable can ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.