Method is_empty

src/data_structures/stack.rs:24–26

returns true if stack is empty else false

(&self)

    // returns true if stack is empty else false
    pub fn is_empty(&self) -> bool {
        self.vec.is_empty()
    }

    // returns a Some<&T> if stack is non-empty else None
    // &T is an immutable reference to an element of type T