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Add support for try to just yield the object to a block if no method is to be called. Kind of like a tap_if_present.
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2 changed files with 23 additions and 1 deletions
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@ -8,6 +8,8 @@ class Object
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# *Unlike* that method however, a +NoMethodError+ exception will *not* be raised
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# and +nil+ will be returned instead, if the receiving object is a +nil+ object or NilClass.
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#
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# If try is called without a method to call, it will yield any given block with the object.
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#
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# ==== Examples
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#
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# Without try
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@ -21,10 +23,20 @@ class Object
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# +try+ also accepts arguments and/or a block, for the method it is trying
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# Person.try(:find, 1)
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# @people.try(:collect) {|p| p.name}
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#
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# Without a method argument try will yield to the block unless the reciever is nil.
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# @person.try { |p| "#{p.first_name} #{p.last_name}" }
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#--
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# +try+ behaves like +Object#send+, unless called on +NilClass+.
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alias_method :try, :__send__
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def try(*a, &b)
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if a.empty? && block_given?
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yield self
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else
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__send__(*a, &b)
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end
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end
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end
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class NilClass #:nodoc:
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@ -134,4 +134,14 @@ class ObjectTryTest < Test::Unit::TestCase
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def test_false_try
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assert_equal 'false', false.try(:to_s)
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end
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def test_try_only_block
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assert_equal @string.reverse, @string.try { |s| s.reverse }
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end
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def test_try_only_block_nil
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ran = false
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nil.try { ran = true }
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assert_equal false, ran
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end
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end
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