Language: C C++ D Haskell Lua OCaml PHP Perl Plain Text Python Ruby Scheme Tcl class Whiler def initialize(&cond) @cond = cond end def do while @cond.call yield end end end def _while(&cond) Whiler.new &cond end x = 0 _while{ x < 3 }.do{ x+=1; p x } Private [?] Run code