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A small mistake: “In Ruby, these functions are map, filter” — is incorrect; filter in Ruby is called select.

Cheers, fixed (as soon as the cache updates)

Also Ruby has 'reduce' as a synonym for 'inject'

...and thank god for that. I find inject a really confusing name.

The Ruby names are copied from Smalltalk, as is much of Ruby.

Also: (++) :: [a] -> [a] -> [a]

Article implies: (++) :: [a] -> a -> [a]