Defining Functions

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Description

Functions in Jaf are first-class values that can be stored in variables, passed as arguments, and returned from other functions.

Syntax

func name(parameter) expression

Parameters

• name - function name
• parameter - single parameter name
• expression - function body (can be block)

Return Value

The function itself (can be assigned to variables)

Examples

Simple function

func square(x) x * x
print(square(5))
# Output: 25

Function with block

func factorial(n) {
    if (n == 0) {
        1
    } else {
        n * factorial(n - 1)
    }
}
print(factorial(5))
# Output: 120

Nested functions

func outer(x) {
    func inner(y) x + y
    inner(10)
}
print(outer(5))
# Output: 15

Multiple expressions

func calculate(x) {
    y = x * 2
    z = y + 10
    z / 3
}
print(calculate(5))
# Output: 6.666...

Notes

• Functions can be defined anywhere
• Function names must be unique in scope
• Body can be any expression (including blocks)
• Recursion is supported
• Functions capture variables from outer scope (closures)

See Also

• Calling functions
• Recursion
• if/else - conditional execution

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