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Partial Function

A clean way to define function as a set of smaller functions where each has defined start and end bounds.

Partial Function

Achieves the following:

f(x) = {
    x     if 0 <= x <   5
    x * 2 if 5 <= x <= 10
}

Expressed as:

let p = PartialFunction::new()
    .with(0.0, 5.0,  Box::new(|x| x    ))
    .with(5.0, 10.0, Box::new(|x| x * 2))
    .build();
assert_eq!(p.eval(5.0), Some(10.0));

or even as:

let p = partfn! {
    [0.0, 5.0]:  x -> x,
    [5.0, 10.0]: x -> x * 2,
};
assert_eq!(p.eval(5.0), Some(10.0));

Lower Partial Function

Achieves the following:

f(x) = {
    x     if 0 <= x <   5
    x * 2 if 5 <= x
}

Expressed as:

let f = LowerPartialFunction::new()
    .with(0.0, Box::new(|x| x    ))
    .with(5.0, Box::new(|x| x * 2))
    .build();
assert_eq!(f.eval(5.0), Some(10.0));

or even as:

let f = lowpartfn! {
    [0.0]: x -> x,
    [5.0]: x -> x * 2,
};
assert_eq!(f.eval(5.0), Some(10.0));

Adding To Your Project

Add the following to your Cargo.toml:

partial_function = "0.5.0"