August 2011
Intermediate to advanced
552 pages
23h 48m
English
Content preview from Advanced Mac OS X Programming: The Big Nerd Ranch GuideBecome 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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Actions
Actions are the lines of code you write that execute whenever a probe is fired. You can assign values to variables, perform computations, and aggregate values over time.
D has no flow control, so there are no if statements and no loops. You can simulate if statements by using predicates, discussed below. The ternary operator (?:) is available, too.
The lack of loops is understandable. DTrace scripts, after they are compiled and verified, are run inside of the kernel. It would be a bad thing to have an unintentional infinite loop occur, locking up the system.
Variables
What is a programming language without variables? D has a number of kinds of variables. Simple (scalar) variables are familiar to those of us used to C, along with structures, ...
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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.