github/ReactiveCocoa — pull request #213 by jspahrsummers (2012-12-24 02:38:05+00:00)
Title: Improve -switch documentation and tests, add +if:then:else:

I've written the pattern inside `+if:then:else:` a couple times now. Basically, when you only want to switch between two signals, it's kind of a pain in the ass to set that up – this simplifies the process.