gistfile1.md

Idea from @sferik's talk at Baruco 2014

Implicit blocks with yield are faster than explicit blocks with #call.

require 'benchmark/ips'

def explicit(&block)
  block.call
end

def implicit
  yield
end

Benchmark.ips do |bm|
  bm.report("explicit block") do
    explicit { "Hello, world" }
  end

  bm.report("implicit block") do
    implicit { "Hello, world" }
  end
end

Higher numbers are better. Iterations per second.

Calculating -------------------------------------
      explicit block     27483 i/100ms
      implicit block     60237 i/100ms
-------------------------------------------------
      explicit block   522159.9 (±10.2%) i/s -    2583402 in   5.033353s
      implicit block  2420161.8 (±9.6%) i/s -   11926926 in   5.015945s

Not sure this is always the way to go as an explicit block reveals intent and is clearer IMO, but very useful to know.