Function definition: Difference between revisions
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Functions defined with explicit parameters may be closures, and those defined with implied parameters are not.
Langur functions are first-order. They are pure in terms of setting values
=== explicit parameters ===
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Operator implied functions are built using an infix operator between curly braces on an f token.
<syntaxhighlight lang="langur">val .multiply = f{x}
.multiply(3, 4)</syntaxhighlight>
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These are built with an infix operator and one operand inside the f{...} tokens.
<syntaxhighlight lang="langur">val .times3 = f{x 3}
map .times3, [1, 2, 3]</syntaxhighlight>
=== impure functions (I/O) ===
Impure functions must be declared as such.
<syntaxhighlight>val .writeit = impure f(.x) { writeln .x }</syntaxhighlight>
Impure functions cannot be passed to pure functions.
=={{header|Lasso}}==
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