Fun with Ruby Symbol Expressions
Groupon released an interesting extension to the Symbol#to_proc method named symbol_expressions over a year ago (I didn’t notice it until recently). It allows you to compose procs based on combinations of existing methods. For instance, to split and then join strings:
I thought this was nifty, but the syntax is a bit odd (brackets are not generally used as argument list boundaries). Additionally, this sort of Proc composition is something a Proc should know how to create, but it doesn’t make sense to have a Symbol keeping track of a list of other Symbols that have been “added” to it (especially via an internal array class). It just seems like a bit of a hack to have Symbols acting as lists of other Symbols.
Based on these ideas, I reduced the symbol_expressions lib to the following lines:
|With this little bit of code (which simply prefixes argument lists with a **||** symbol), you can now do stuff like this:|
Fun stuff. Ruby consistently amazes me with its expressiveness.