blocks vs lambda

benchmark.rb

require 'benchmark/ips'

Lambda = ->n { n.even? }

Benchmark.ips do |x|
  x.report('map with lambda literal') { (1..1_000).map(&->n { n.even? }) }
  x.report('map with lambda constant') { (1..1_000).map(&Lambda) }
  x.report('map with block') { (1..1_000).map { |n| n.even? } }
  x.report('map with &') { (1..1_000).map(&:even?) }

  x.compare!
end