Question

How to create a simple timer method in Ruby that takes an arbitrary function call?

For example:
time rspec or time get_primes(54784637)

It should still return the result of the function that is passed in (get_primes).

The following doesn’t quite work:

def time block
  t = Time.now
  result = eval(block)
  puts "\nCompleted in #{(Time.now - t).format} seconds"
  result
end

Ruby 1.9.3

Answer 1

It’s more Rubyesque to use a block:

def time
  t = Time.now
  result = yield
  puts "\nCompleted in #{Time.now - t} seconds"
  result
end

time { rspec }