first

        # Range.first

(from ruby core)
---
    first -> object
    first(n) -> array

---

With no argument, returns the first element of `self`, if it exists:

    (1..4).first     # => 1
    ('a'..'d').first # => "a"

With non-negative integer argument `n` given, returns the first `n`
elements in an array:

    (1..10).first(3) # => [1, 2, 3]
    (1..10).first(0) # => []
    (1..4).first(50) # => [1, 2, 3, 4]

Raises an exception if there is no first element:

    (..4).first # Raises RangeError