From d3ea800cba86fad042a5f21332143aeddff5c16f Mon Sep 17 00:00:00 2001 From: ksss Date: Thu, 27 Mar 2014 19:35:15 +0900 Subject: Implement Object#tap --- mrbgems/mruby-object-ext/mrblib/object.rb | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) create mode 100644 mrbgems/mruby-object-ext/mrblib/object.rb (limited to 'mrbgems/mruby-object-ext/mrblib/object.rb') diff --git a/mrbgems/mruby-object-ext/mrblib/object.rb b/mrbgems/mruby-object-ext/mrblib/object.rb new file mode 100644 index 000000000..581156cb0 --- /dev/null +++ b/mrbgems/mruby-object-ext/mrblib/object.rb @@ -0,0 +1,19 @@ +class Object + ## + # call-seq: + # obj.tap{|x|...} -> obj + # + # Yields 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 +end -- cgit v1.2.3