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-rw-r--r--activesupport/lib/active_support/core_ext/object/misc.rb32
1 files changed, 15 insertions, 17 deletions
diff --git a/activesupport/lib/active_support/core_ext/object/misc.rb b/activesupport/lib/active_support/core_ext/object/misc.rb
index 46f9c7d676..4acdfa3d6c 100644
--- a/activesupport/lib/active_support/core_ext/object/misc.rb
+++ b/activesupport/lib/active_support/core_ext/object/misc.rb
@@ -40,6 +40,21 @@ class Object
value
end
+ # Yields <code>x</code> to the block, and then returns <code>x</code>.
+ # 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)
+
# An elegant way to factor duplication out of options passed to a series of
# method calls. Each method called in the block, with the block variable as
# the receiver, will have its options merged with the default +options+ hash
@@ -72,21 +87,4 @@ class Object
respond_to? "acts_like_#{duck}?"
end
- # Tries to send the method only if object responds to it. Return +nil+ otherwise.
- # It will also forward any arguments and/or block like Object#send does.
- #
- # ==== Example :
- #
- # # Without try
- # @person ? @person.name : nil
- #
- # With try
- # @person.try(:name)
- #
- # # try also accepts arguments/blocks for the method it is trying
- # Person.try(:find, 1)
- # @people.try(:map) {|p| p.name}
- def try(method, *args, &block)
- send(method, *args, &block) if respond_to?(method, true)
- end
end