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object.c: Add a new alias then to Kernel#yield_self; [Feature #14594]

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git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63525 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
matz 2018-05-30 08:24:52 +00:00
parent 47f9dd8419
commit d53ee00891
2 changed files with 8 additions and 1 deletions
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4
object.c
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@ -564,12 +564,13 @@ rb_obj_size(VALUE self, VALUE args, VALUE obj)
/*
* call-seq:
* obj.then {|x| block } -> an_object
* obj.yield_self {|x| block } -> an_object
*
* Yields self to the block and returns the result of the block.
*
* 3.next.then {|x| x**x }.to_s #=> "256"
* "my string".yield_self {|s| s.upcase } #=> "MY STRING"
* 3.next.yield_self {|x| x**x }.to_s #=> "256"
*
*/
@ -4065,6 +4066,7 @@ InitVM_Object(void)
rb_define_method(rb_mKernel, "dup", rb_obj_dup, 0);
rb_define_method(rb_mKernel, "itself", rb_obj_itself, 0);
rb_define_method(rb_mKernel, "yield_self", rb_obj_yield_self, 0);
rb_define_method(rb_mKernel, "then", rb_obj_yield_self, 0);
rb_define_method(rb_mKernel, "initialize_copy", rb_obj_init_copy, 1);
rb_define_method(rb_mKernel, "initialize_dup", rb_obj_init_dup_clone, 1);
rb_define_method(rb_mKernel, "initialize_clone", rb_obj_init_dup_clone, 1);

5
spec/ruby/core/kernel/yield_self_spec.rb
View file

@ -20,5 +20,10 @@ ruby_version_is "2.5" do
enum.peek.should equal object
enum.first.should equal object
end
it "has an alias `then`" do
object = Object.new
object.then { 42 }.should equal 42
end
end
end