drags palm down face

The difference between Proc.new, Kernel#proc, and Kernel#lambda

Just for the heck of it, I was curious how closures performed in Ruby. The case is similar for 1.8 and 1.9.

def counter count = 0 return lambda { count += 1 } end

c = counter </code>

class Counter attr :count

def initialize @count = 0 end

def call @count += 1 end end

c = Counter.new </code>

Doing a million iterations:

user system total real 0.900000 0.010000 0.910000 ( 0.945943) 0.470000 0.000000 0.470000 ( 0.489510)

Clearly classes are a faster way to make a counter…

Memory usage is even more different. The following is after allocation of a million of these little counters:

TIME RPRVT RSHRD RSIZE VSIZE 0:05.85 315M 1.14M 316M 352M 0:01.86 108M 1.16M 108M 144M

Merely thought it was interesting and wanted to share :)