Call a function: Difference between revisions
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=={{header|langur}}==
Functions are first-order, and may be passed around, whether user-defined or built-in.
There are several ways to call a function in langur.
=== parentheses ===
You can always call a function using parentheses.
<syntaxhighlight lang="langur">.x()▼
x()
</syntaxhighlight>
<syntaxhighlight lang="langur">
write(somestring)
</syntaxhighlight>
=== unbounded argument lists ===
In statement context, you can call a function with an unbounded list of arguments.
<syntaxhighlight lang="langur">write .key, ": ", .value▼
<syntaxhighlight lang="langur">
writeln a, b, c
=== forwarding operator ===
When passing a single argument, you can use the forwarding operator.
<syntaxhighlight lang="langur">
a -> len
# passes a to the len() function
</syntaxhighlight>
=== recursion ===
Use the fn token with double parentheses for recursion.
val fibonacci = fn x:if x < 2 { x } else { fn((x - 1)) + fn((x - 2)) }
</syntaxhighlight>
=== argument expansion ===
Use the expansion operator (...) to pass a list as multiple arguments. The following example works if wordsets is a list of lists, and passes each list as a separate argument to the mapX function.
mapX(amb, wordsets...)
</syntaxhighlight>
=={{header|Latitude}}==
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