block_given? vs defined? yield

block_given? vs defined? yield - Ruby Forum

On Feb 8, 2006, at 12:01 PM, Yukihiro Matsumoto wrote: > might be a little bit faster, but practically you can consider them > same. > > matz. > I didn't know yield could be considered "defined" or not. Does this mean yield is not a key word? irb(main):014:0> def quby irb(main):015:1> puts hello irb(main):016:1> irb(main):017:1> end => nil irb(main):018:0> defined? quby => "method" Gasp! irb(main):020:0> def with_ablock irb(main):021:1> p defined? yield irb(main):022:1> end => nil irb(main):023:0> with_ablock { 1 } "yield" => nil irb(main):024:0> with_ablock nil => nil Well that shows home much I know about the operation of defined? (that is to say very little.) So is yield a method that only has scope inside the calling method? I tired one of these method(:yield) but it didn't work. (Nor should it, even if my previous statement is correct). I thought maybe defined? worked...

Full article: http://www.ruby-forum.com/topic/54052