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Ingy döt Net 2023-07-01 11:58:00 -04:00
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Task/Call-a-function/REXX/call-a-function-8.rexx Normal file
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/*╔════════════════════════════════════════════════════════════════════╗
║ Distinguishing subroutines and functions. ║
║ ║
║ There is no programmatic difference between subroutines and ║
║ functions if the subroutine returns a value (which effectively ║
║ makes it a function). REXX allows you to call a function as if ║
║ it were a subroutine. ║
╚════════════════════════════════════════════════════════════════════╝*/
/*╔════════════════════════════════════════════════════════════════════╗
║ In REXX, all arguments are passed by value, never by name, but it ║
║ is possible to accomplish this if the variable's name is passed ║
║ and the subroutine/function could use the built-in-function VALUE ║
║ to retrieve the variable's value. ║
╚════════════════════════════════════════════════════════════════════╝*/
/*╔════════════════════════════════════════════════════════════════════╗
║ In the REXX language, partial application is possible, depending ║
║ how partial application is defined; I prefer the 1st definition ║
║ (as per the "discussion" for "Partial Function Application" task: ║
║ 1. The "syntactic sugar" that allows one to write some examples ║
║ are: map (f 1 9) [1..9] ║
║ or: map (f(1,_,9)) [1, ..., 9] ║
╚════════════════════════════════════════════════════════════════════╝*/