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* Add Object#embed which works like tap but returns the block's value #67

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* Add Object#embed which works like tap but returns the block's value #67

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5 changes: 5 additions & 0 deletions ChangeLog
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Original file line number Original file line Diff line number Diff line change
@@ -1,3 +1,8 @@
Wed Dec 14 22:23:14 2011 <pyr@omega>

* object.c: Add Object#embed which works like tap but returns the block's
value. Useful in method chains.

Wed Dec 14 21:58:42 2011 NAKAMURA Usaku <usa@ruby-lang.org> Wed Dec 14 21:58:42 2011 NAKAMURA Usaku <usa@ruby-lang.org>


* test/ruby/test_io_m17n.rb * test/ruby/test_io_m17n.rb
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21 changes: 21 additions & 0 deletions object.c
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Expand Up @@ -555,6 +555,26 @@ rb_obj_tap(VALUE obj)
return obj; return obj;
} }


/*
* call-seq:
* obj.embed{|x|...} -> obj
*
* Yields <code>x</code> to the block, and then returns the return value
* of the block. The primary purpose of this method is to modify the object
* in place in a method chain.
*
* (1..10).embed {|x| {:numbers => x}}
*
*/
VALUE
rb_obj_embed(VALUE obj)
{
VALUE retval;

retval = rb_yield(obj);
return retval;
}



/* /*
* Document-method: inherited * Document-method: inherited
Expand Down Expand Up @@ -2780,6 +2800,7 @@ Init_Object(void)
rb_define_method(rb_mKernel, "kind_of?", rb_obj_is_kind_of, 1); rb_define_method(rb_mKernel, "kind_of?", rb_obj_is_kind_of, 1);
rb_define_method(rb_mKernel, "is_a?", rb_obj_is_kind_of, 1); rb_define_method(rb_mKernel, "is_a?", rb_obj_is_kind_of, 1);
rb_define_method(rb_mKernel, "tap", rb_obj_tap, 0); rb_define_method(rb_mKernel, "tap", rb_obj_tap, 0);
rb_define_method(rb_mKernel, "embed", rb_obj_embed, 0);


rb_define_global_function("sprintf", rb_f_sprintf, -1); /* in sprintf.c */ rb_define_global_function("sprintf", rb_f_sprintf, -1); /* in sprintf.c */
rb_define_global_function("format", rb_f_sprintf, -1); /* in sprintf.c */ rb_define_global_function("format", rb_f_sprintf, -1); /* in sprintf.c */
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