Yes, it appears to be bad for performance.
def time
start = Time.now
yield
"%.6f" % (Time.now - start)
end
def do_nothing(arg)
end
RUBY_VERSION # => "1.9.2"
# small
ary = *1..10
time { ary.each(&method(:do_nothing)) } # => "0.000019"
time { ary.each { |arg| do_nothing arg } } # => "0.000003"
# large
ary = *1..10_000
time { ary.each(&method(:do_nothing)) } # => "0.002787"
time { ary.each { |arg| do_nothing arg } } # => "0.001810"
# huge
ary = *1..10_000_000
time { ary.each(&method(:do_nothing)) } # => "37.901283"
time { ary.each { |arg| do_nothing arg } } # => "1.754063"
It looks like this is addressed in JRuby:
$ rvm use jruby
Using /Users/joshuajcheek/.rvm/gems/jruby-1.6.3
$ xmpfilter f.rb
def time
start = Time.now
yield
"%.6f" % (Time.now - start)
end
def do_nothing(arg)
end
RUBY_VERSION # => "1.8.7"
# small
ary = *1..10
time { ary.each(&method(:do_nothing)) } # => "0.009000"
time { ary.each { |arg| do_nothing arg } } # => "0.001000"
# large
ary = *1..10_000
time { ary.each(&method(:do_nothing)) } # => "0.043000"
time { ary.each { |arg| do_nothing arg } } # => "0.055000"
# huge
ary = *1..10_000_000
time { ary.each(&method(:do_nothing)) } # => "0.427000"
time { ary.each { |arg| do_nothing arg } } # => "0.634000"