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Call a function: Difference between revisions
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=={{header|Haskell}}==
<lang haskell>
-- Calling a function with a fixed number of arguments
multiply x y = x * y
multiply 10 20 -- returns 200
-- Calling a function that requires no arguments
-- Normally, you use constant instead of function without arguments:
twopi = 6.28
-- But you can also pass special value as the first argument indicating function call:
twopi () = 6.28 -- definition
twopi :: Num a => () -> a -- its type
twopi () -- returns 6.28
-- TODO:
-- Calling a function with optional arguments
-- Calling a function with a variable number of arguments
-- Calling a function with named arguments
-- Using a function in statement context
-- Using a function in first-class context within an expression
-- Obtaining the return value of a function
-- Distinguishing built-in functions and user-defined functions
-- Distinguishing subroutines and functions
-- Stating whether arguments are passed by value or by reference
-- Is partial application possible and how
</lang>
=={{header|J}}==
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