November 2016
Intermediate to advanced
697 pages
14h 44m
English
Content preview from Julia: High Performance ProgrammingBecome 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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Scope revisited
The for, while, and try blocks (but not the if blocks) all introduce a new scope. Variables defined in these blocks are only known to that scope. This is called the local scope, and nested blocks can introduce several levels of local scope.
Variables with the same name in different scopes can safely be used simultaneously. If a variable exists both in global (that is top level) and local scope, you can distinguish between which one you want to use by prefixing them with the global or local keyword:
global: This indicates that you want to use the variable from the outer, global scope. This applies to the whole of the current scope block.local: This means that you want to define a new variable in the current scope.
The following example ...
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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.