Call a function: Difference between revisions
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## For partial function application see: |
## For partial function application see: |
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## http://rosettacode.org/wiki/Partial_function_application#Python</lang> |
## http://rosettacode.org/wiki/Partial_function_application#Python</lang> |
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=={{header|Racket}}== |
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<lang Racket> |
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#lang racket |
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;; Calling a function that requires no arguments |
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(foo) |
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;; Calling a function with a fixed number of arguments |
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(foo 1 2 3) |
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;; Calling a function with optional arguments |
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;; Calling a function with a variable number of arguments |
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(foo 1 2 3) ; same in both cases |
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;; Calling a function with named arguments |
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(foo 1 2 #:x 3) ; using #:keywords for the names |
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;; Using a function in statement context |
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;; Using a function in first-class context within an expression |
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;; Obtaining the return value of a function |
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;; -> Makes no sense for Racket, as well as most other functional PLs |
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;; Distinguishing built-in functions and user-defined functions |
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(primitive? foo) |
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;; but this is mostly useless, since most of Racket is implemented in |
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;; itself |
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;; Distinguishing subroutines and functions |
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;; -> No difference, though `!' is an idiomatic suffix for names of |
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;; side-effect functions, and they usually return (void) |
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;; Stating whether arguments are passed by value or by reference |
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;; -> Always by value, but it's possible to implement languages with |
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;; other argument passing styles, including passing arguments by |
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;; reference (eg, there is "#lang algol60") |
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;; Is partial application possible and how |
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(curry foo 1 2) ; later apply this on 3 |
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(λ(x) (foo 1 2 x)) ; a direct way of doing the same |
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</lang> |
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=={{header|REXX}}== |
=={{header|REXX}}== |
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