method_bench.rb

require "benchmark/ips"

def f(x)
  x + 1
end

a = (1..1000).to_a

raise unless a.map(&method(:f)) == a.map { |x| f(x) }

Benchmark.ips do |x|
  x.report("method") do
    a.map(&method(:f))
  end

  x.report("proc") do
    a.map { |x| f(x) }
  end

  x.compare!
end

# Warming up --------------------------------------
#               method     1.384k i/100ms
#                 proc     1.213k i/100ms
# Calculating -------------------------------------
#               method     15.387k (±11.7%) i/s -     76.120k in   5.065370s
#                 proc     12.162k (± 9.7%) i/s -     60.650k in   5.044157s

# Comparison:
#               method:    15387.0 i/s
#                 proc:    12162.3 i/s - 1.27x  slower