On 04/28/2012 10:37 PM, Lyndon Maydwell wrote:
Your first example is not behaving how you think it is...
ruby-1.9.2-p0 :012 > def foo ruby-1.9.2-p0 :013?> puts "foo" ruby-1.9.2-p0 :014?> end => nil ruby-1.9.2-p0 :015 > def call_arg(f) ruby-1.9.2-p0 :016?> puts "calling" ruby-1.9.2-p0 :017?> f ruby-1.9.2-p0 :018?> end => nil ruby-1.9.2-p0 :019 > call_arg(foo) foo calling => nil
Note that "foo" is printed before "calling".
Indeed, I tried to make the example cute and botched it. This should be less screwupy (you have to desugar the 'def...' to make it work properly). foo = Proc.new { puts "foo" } bar = lambda { puts "bar" } def baz puts "baz" end def call_arg(f) puts "before call" f.call() puts "after call" end call_arg(foo) puts "" call_arg(bar) puts "" call_arg(method(:baz))