Function unless 

pub fn unless<'a, Brand: Applicative>(
    condition: bool,
    action: <Brand as Kind_cdc7cd43dac7585f>::Of<'a, ()>,
) -> <Brand as Kind_cdc7cd43dac7585f>::Of<'a, ()>

Performs an applicative action unless a condition is true.

Returns the given action if condition is false, otherwise returns pure(()).

Type Signature

forall Brand. Applicative Brand => (bool, Brand ()) -> Brand ()

Type Parameters

• 'a: The lifetime of the computation.
• Brand: The brand of the applicative.

Parameters

• condition: The condition to check.
• action: The action to perform if the condition is false.

Returns

The action if the condition is false, otherwise pure(()).

Examples

use fp_library::{
	brands::*,
	functions::*,
};

assert_eq!(unless::<OptionBrand>(false, Some(())), Some(()));
assert_eq!(unless::<OptionBrand>(true, Some(())), Some(()));
assert_eq!(unless::<VecBrand>(false, vec![(), ()]), vec![(), ()]);
assert_eq!(unless::<VecBrand>(true, vec![(), ()]), vec![()]);