December 2019
Intermediate to advanced
248 pages
5h 34m
English
Content preview from Designing Elixir Systems With OTPBecome 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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Keep the Left Margin Skinny
You can tell a lot about a programmer by scanning code. For Elixir, this is especially true. When scanning Elixir, look for long pipelines, short functions, and skinny left margins. We’ve talked about designing for composition and single level of abstraction. Skinny left margins mean decisions are often made in pattern matches instead of control structures like if, cond, and case. Skinny left margins make single concept functions much more likely, and simplify tests. Let’s take an example.
When a user answers a question, the response may be correct or incorrect. We’ve built a boolean into our Response struct for the purposes of quickly making decisions with pattern matching. It looks like this:
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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.