Extra Ruby chaining, not that costly

A few folks suggested I try lazy enumerables to make my extremely chained style practical. I was curious about the actual costs of my style, so it’s time for lies and microbenchmarks! Turns out naively chaining a bunch of maps together isn’t very costly, so go with that to start.

Lazy came in much slower than consolidating the logic in one loop or chaining them without lazy. I thought, I must not have used lazy properly. Turns out, I’m probably showing that laziness isn’t well suited to iterating over collections without an early termination clause (e.g. a take, first, or find) and that for small collections (like an 87-line /etc/passwd), the cost of the lazy plumbing can noticeably outweigh the work done inside the loops. Thanks to Rein Heinrich for talking me to the bottom line!

Categorized as Code

By Adam Keys

Telling a joke. Typing.