Ep 082: Filter and Friends

Functional Design in Clojure

Each week, we discuss a different topic about Clojure and functional programming.

If you have a question or topic you’d like us to discuss, tweet @clojuredesign, send an email to [e-mail], or join the #clojuredesign-podcast channel on the Clojurians Slack.

This week, the topic is: “filter, filterv, remove, keep, and keep-indexed.” We talk about sifting data and marvel at the simple function that can turn two steps into one.

Selected quotes:

• “It’s not just linguistic, it helps it make more sense.”
• “We should be more positive about our intent.”
• “Clojure’s sense of falsey is thankfully limited to nil and false.”
• “Nil is a positive statement that it didn’t work out.”
• “Keep is great for those times where you need data for both the transform and the filter.”
• “It’s only a complement away!”
• “Reaching for optimization too early leads to more complexity.”

Links:

• filter
• filterv
• remove
• keep
• keep-indexed