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Since I started learning Objective-C and Cocoa, I’ve been wondering why they have chosen the extension .m for the implementation files – was it supposed to mean something, or was it just a random letter?
Today most people would refer to them as ‘method files’, but
(from the book ‘Learn Objective-C on the Mac‘ by Mark Dalrymple and Scott Knaster, page 9)
EDIT: To satisfy an itch I emailed Brad Cox, the inventor of Objective-C, about the question and he answered with this single line:
Here’s the email as visual proof: