Higher-Order Messages in Cocoa
"HOM, or Higher-Order Messaging, refers to the treatment of a message as a data type, like an object, so that it can be used as the argument in another message. This is analogous to languages that treat functions as a first-class data type, like Lisp, Haskell, and PHP do. Even C and its descendants can use function pointers, although it's not as pretty."
(Submitted by Noel Mon Jul 19, 2004 )
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