originOS Functions

Functions and lambdas in OSL are defined using the function or def keyword with parameter syntax and a body.

Syntax

myFunc = function(params) -> ( body )

myFunc = def(params) -> ( body )

Parameters

• params: Parameter names (can be zero or more, comma-separated)

• body: The function body containing the logic to execute

Return Value

Returns a callable function object.

Usage

Single Parameter

add10 = def(v) -> ( v + 10 )

log add10(5)
// 15

Multiple Parameters

add = def(a, b) -> ( a + b )

log add(3, 7)
// 10

No Parameters

greet = def() -> ( "Hello" )

log greet()
// Hello

Multi-line Body

calculate = def(x) -> (
  squared = x * x
  squared + 10
)

log calculate(5)
// 35

Notes

• Both function and def keywords work identically for defining lambdas

• The arrow -> separates parameters from the body

• The body can be a single expression or multiple statements in parentheses

• Functions are first-class values and can be passed as arguments or stored in variables