Code shared from the Rust Playground

playground.rs

trait Truthy: Sized {
    fn is_truthy(&self) -> bool;
    fn as_option(self) -> Option<Self> {
        if self.is_truthy() {
            Some(self)
        } else {
            None
        }
    }
}

impl Truthy for &str {
    fn is_truthy(&self) -> bool {
        !self.is_empty()
    }
}

impl Truthy for String {
    fn is_truthy(&self) -> bool {
        !self.is_empty()
    }
}

macro_rules! truthy_zero {
    {$($Type:ident)*} => {$(
        impl Truthy for $Type {
            fn is_truthy(&self) -> bool {
                *self == Self::default()
            }
        }
    )*}
}

truthy_zero!{
    i8 i16 i32 i64 isize
    u8 u16 u32 u64 usize
    f32 f64
}