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=={{header|langur}}==
multiply(3, 4)< /syntaxhighlight> ▼Langur functions are first-order. They are pure in terms of setting values and in terms of I/O (unless declared impure).
val multiply = fn{*}
multiply(3, 4)</syntaxhighlight> ▼
map times3, [1, 2, 3]< /syntaxhighlight> ▼A return statement may be used, but a function's last value is its implicit return value.
val multiply = fn a, b: a * b
</syntaxhighlight>
=== parameters ===
Parameters are defined within parentheses after the fn token. To specify no parameters, use an empty set of parentheses.
<syntaxhighlight lang="langur">val multiply = fn(x, y) { x * y }
▲multiply(3, 4)</syntaxhighlight>
=== operator implied functions ===
Operator implied functions are built using an infix operator between curly braces on an fn token.
<syntaxhighlight lang="langur">val multiply = fn{*}
▲multiply(3, 4)</syntaxhighlight>
=== nil left partially implied functions ===
These are built with an infix operator and a right-hand operand inside the fn{ } tokens.
<syntaxhighlight lang="langur">val times3 = fn{* 3}
▲map times3, [1, 2, 3]</syntaxhighlight>
=== impure effects ===
Functions with impure effects must be declared as such, using fn*.
<syntaxhighlight>
val writeitmultiply = fn*(xa, b) { writelna * xb }
</syntaxhighlight>
Impure functions cannot be passed to pure functions.
=={{header|Lasso}}==
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