array_methods/rfind.rb

tests/_examples/array_methods/rfind.rb in the metorex repository.

# `rfind` reads an array from the end, `Method#box` names no namespace while
# namespaces are off, and the core classes built natively descend from
# Object and through it from Kernel and BasicObject.
p([1, 2, 3].rfind { |number| number < 3 })
p([1, 2, 3].rfind(-> { :none }) { |number| number > 5 })
p([1, 2].rfind.to_a)
shrinking = [1, 2, 3, 4]
p(shrinking.rfind { shrinking.pop; false })

def answer = 42
p(method(:answer).box)
p(1.method(:+).box)

p(Time.ancestors)
p(Thread.ancestors)
p(Thread::Mutex.ancestors)

Output:

2
:none
[2, 1]
nil
nil
nil
[Time, Comparable, Object, Kernel, BasicObject]
[Thread, Object, Kernel, BasicObject]
[Thread::Mutex, Object, Kernel, BasicObject]