burke

fac = lambda{|n| n.zero? ? 1 : n * fac.call(n-1)} 

burke

# Ruby 1.8.7
lambda{|n| (fac=lambda{|n| n.zero? ? 1 : n * fac.call(n-1)}).call(n) }

# Ruby 1.9
->(n){(fac=->(n){n.zero? ? 1 : n * fac.(n-1)}).(n)}

burke

(λ f. f 3) (λ x. x + 2)

burke

# Ruby 1.8.7
lambda{|f| f[3]}[lambda{|x| x+2}]

burke

# Ruby 1.9
->(f){f.(3)}.(->(x){x+2})

burke

#rails/actionpack/lib/action_view/helpers/form_helper.rb:508
if @object_name.sub!(/\[\]$/,'') 
  if object ||= @template_object.instance_variable_get("@#{Regexp.last_match.pre_match}") and object.respond_to?(:to_param) 
    @auto_index = object.to_param 
  else 
    raise ArgumentError, "object[] naming but object param and @object var don't exist or don't respond to to_param: #{object.inspect}" 
 end 
end

burke

[?x,?k,?c,?d].map(&'_-96').fold(&'+')

burke

if ( window.addEventListener ) { 
  var kkeys = [], konami = "38,38,40,40,37,39,37,39,66,65"; 
  window.addEventListener("keydown", function(e){ 
    kkeys.push( e.keyCode ); 
    if ( kkeys.toString().indexOf( konami ) >= 0 ) 
      window.location = "http://example.com/"; 
  }, true); 
}

burke

if ( window.addEventListener ) { 
  var kkeys = [], konami = "38,38,40,40,37,39,37,39,66,65"; 
  window.addEventListener("keydown", function(e){ 
    kkeys.shift(); 
    kkeys[9] = e.keyCode; 
    if ( kkeys.toString() == konami ) 
      window.location = "http://example.com"; 
  }, true); 
}

burke

def Y 
  lambda { |f| f.call(f) }.call( 
    lambda do |g| 
      yield(lambda { |*n| g.call(g).call(*n) }) 
    end) 
end 
 
Y { |this| lambda { |n| n == 0 ? 1 : n * this.call(n - 1) } }.call(12) 
#=> 479001600