Crate then 

The standard library named bool::then_some and bool::then strangely. It should have been then and then_with. I find it annoying that expr.then(|| value) is shorter to type that the more “idiomatic” expr.then_some(value)

This crate provides these functions under the following names .some and .some_with.

Getting started

First, add the crate to your Cargo manifest.

cargo add then

Now bring the trait into scope.

use then::Some;

The .some and .some_with methods are now available on bool.

assert_eq!(false.some(0), None);
assert_eq!(true.some_with(Default::default), Some(0));

Traits

Some

Provides the some and some_with methods on bool.