November 2015
Intermediate to advanced
200 pages
4h 26m
English
Content preview from Ruby Performance OptimizationBecome 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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Optimize Your Iterators
To a Ruby newcomer, Ruby iterators typically look like a convenient syntax for loops. In fact, iterators are such a good abstraction that even seasoned developers often forget that they really are nothing more than methods of Array and Hash classes with a block argument.
However, keeping this in mind is important for performance. We talked in Modify Arrays and Hashes in Place about the importance of in-place operations on hashes and arrays. But that’s not the end of the story.
Because a Ruby iterator is a function of an object (Array, Range, Hash, etc.), it has two characteristics that affect performance:
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Ruby GC will not garbage collect the object you’re iterating before the iterator is finished. This means that ...
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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.