August 2014
Intermediate to advanced
120 pages
2h 45m
English
Content preview from Mastering Clojure MacrosBecome 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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Turning Expressions Inside Out with Threading Macros
Some of Clojure’s most fun built-in macros are the ones that allow you to rewrite deeply nested expressions in a way that more closely reflects their execution order. In this section, we’ll take a look at how we can use these threading macros to simplify our code and how those macros work their magic. And to avoid confusion: threading in this context has nothing to do with JVM/OS threads; the two concepts just have an unfortunate naming collision.
The most common of these macros is ->, which threads the result of each expression into the next one as the first argument (converting symbols to lists where the next expression is not a list). Perhaps you’ve seen this macro before, when composing ...
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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.