Inspect and mutate values without leaving the method chain.
rust
use tap_trait::Tap;
use pipe_trait::Pipe;
let result = 2i32
.tap(|x| assert_eq!(x, 2))
.tap_mut(|x| *x += 1)
.tap(|x| assert_eq!(x, 3))
.tap_mut(|x| *x *= 3)
.tap(|x| assert_eq!(x, 9))
.pipe(|x| -x)
.tap(|x| assert_eq!(x, -9))
.pipe_ref(ToString::to_string)
.tap_ref(|x| assert_eq!(x, "-9"))
.tap_mut(|x| *x += ".0")
.tap_ref(|x| assert_eq!(x, "-9.0"));
assert_eq!(result, "-9.0");