collections

Paul Phillips, a Typesafe co-founder and prolific Scala committer, explains why he walked away from Scala. He critiques the Scala collections library and presents his own design focused on immutability, performance and correctness.

Paul Phillips, a major Scala compiler contributor, gives a long talk on Scala collections and views, using it to critique Scala's design and direction.

Rich Hickey's keynote at RailsConf 2012, a close sibling of his 'Simple Made Easy' talk. He distinguishes simple (not intertwined) from easy (familiar), and argues that software complexity comes from complecting things, with Rails-specific examples including large gem collections.

Rich Hickey introduces transducers in Clojure, a way to make map, filter and similar algorithms composable independent of the data source. This avoids duplicated implementations and intermediate collections across sequences, channels and streams.