pat 1.0.1

tap values in place
Documentation 
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pub trait Tap: Sized {
    fn tap<F: FnOnce(&mut Self)>(mut self, f: F) -> Self {
        f(&mut self);
        self
    }
}

impl<T> Tap for T {}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_tap_with_integer() {
        let result = 5.tap(|x| *x += 1).tap(|x| *x *= 2);

        assert_eq!(result, 12);
    }

    #[test]
    fn test_tap_with_vector() {
        let vec = vec![1, 2, 3];
        let tapped_vec = vec.tap(|v| v.push(4)).tap(|v| v.sort_by(|a, b| b.cmp(a)));

        assert_eq!(tapped_vec, vec![4, 3, 2, 1]);
    }

    #[test]
    fn test_tap_with_string() {
        let string = String::from("hello");
        let tapped_string = string.tap(|s| s.push_str(", world")).tap(|s| s.make_ascii_uppercase());

        assert_eq!(tapped_string, "HELLO, WORLD");
    }
}