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I’m trying to figure out how Ruby handles chaining enumerators that yield multiple arguments. Take a look at this snippet:
a = ['a', 'b', 'c']
a.each_with_index.select{|pr| p pr}
# prints:
# ["a", 0]
# ["b", 1]
# ["c", 2]
a.each_with_index.map{|pr| p pr}
# prints:
# "a"
# "b"
# "c"
Why does select yield the arguments as an array, whereas map yields them as two separate arguments?
From the discourse so far, it follows that we can analyze the source code, but we do not know the whys. Ruby core team is relatively very responsive. I recommend you to sign in at http://bugs.ruby-lang.org/issues/ and post a bug report there. They will surely look at this issue at most within a few weeks, and you can probably expect it corrected in the next minor version of Ruby. (That is, unless there is a design rationale unknown to us to keep things as they are.)