Functions are declared with fn.
A function f with no parameters and no return type has the form:
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Function parameters are comma-separated, and declared between the ().
They have the form name : type.
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Functions that return a value declare the function’s return type between the parameter list and the function body.
The return type of this function is vec3f:
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// Function with no arguments and no return value
fn do_nothing() {
}
// Function with a single 'i32' parameter, no return value
fn eat_an_i32(my_param : i32) {
}
// Function with no arguments, which returns a 'i32' value
fn give_me_a_number() -> i32 {
return 42;
}
// Function with two parameters, which returns a 'f32' value
fn average(a : f32, b : f32) -> f32 {
return (a + b) / 2;
}