February 2018
Intermediate to advanced
304 pages
7h 11m
English
Content preview from Programming Clojure, 3rd EditionBecome 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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Validating Data
Any time you receive a value from a user or an external source, that data may contain values that break your expectations. Instead, Clojure specs precisely describe those expectations, check whether the data is valid, and determine how it conforms to the specification. In the case where data is invalid, you may want to know what parts are invalid and why.
Predicates are the simplest kind of spec—they check whether a predicate matches a single value. Other specs compose predicates (and other specs) to create more complicated specifications. Some of the tools we’ll discuss include range specs, logical connectors like and and or, and collection specs. These specs combine to cover any data structure you need to describe.
Predicates ...
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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.