14th Jul 2008 | Tags: ruby
Question #1: Why is Symbol#to_proc so popular?
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 class Array alias old_map map def map(method=nil, *args, &blk) return old_each(&blk) if block_given? old_map do |e| e.send(method, *args) end end end ary = %w(hello world) puts ary.map(:reverse).join(" ") puts ary.map(:*, 2).join(" ") puts ary.map(:slice, 1, 3).join(" ")
It should be trivial to do this for the other common enumerable methods, the only places I see Symbol#to_proc used, anyway.
I posit that the answer is question 2.
Question #2: Why do I need to do this method hackery in Array instead of Enumerable? I can understand Array having its own definitions of the standard collection methods for performance reasons, but in a properly OO system, that should be transparent to me.