x
to the block, and then returns x
.
# The primary purpose of this method is to "tap into" a method chain,
# in order to perform operations on intermediate results within the chain.
#
# (1..10).tap { |x| puts "original: #{x.inspect}" }.to_a.
# tap { |x| puts "array: #{x.inspect}" }.
# select { |x| x%2 == 0 }.
# tap { |x| puts "evens: #{x.inspect}" }.
# map { |x| x*x }.
# tap { |x| puts "squares: #{x.inspect}" }
def tap
yield self
self
end unless Object.respond_to?(:tap)
end