Call a function: Difference between revisions
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add2 1 #=> 3
</lang>
=={{header|Déjà Vu}}==
<lang dejavu># all functions except foo are from the standard library
# calling a function with no arguments:
random-int
# calling a function with a fixed number of arguments:
+ 1 2
# calling a function with optional arguments:
# optional arguments are not really possible as such
# strategies are:
# 1) differently named functions:
sort [ 3 2 1 ]
sort-by @len [ "Hello" "World" "Bob" ]
# 2) differentiate by value of other arguments:
foo ?????????????????????????????????????????????????????
# calling a function with a variable number of arguments:
# generally with a special terminator value, which one depends
# on the function called
concat( 1 2 3 )
[ 1 2 3 ]
set{ :foo :bar :spam }
# calling a function with named arguments: not possible
# using a function in first-class context within an expression
$ @-- @len # $ is "compose", so the function returned is "one less than the length"
# obtaining the return value of a function
# return values are always pushed on the stack, so you don't need anything special
random-int
# discarding the return value of a function
drop random-int
(WIP)
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
=={{header|Erlang}}==
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