benchmark_mass_assignment.rb

require 'benchmark/ips'

Benchmark.ips do |r|
  r.report("mass") do
    a, b, c, d = 1, 2, 3, 4
  end

  r.report("step by step") do
    a = 1
    b = 2
    c = 3
    d = 4
  end
end

# Calculating -------------------------------------
#                 mass     66174 i/100ms
#         step by step     96824 i/100ms
# -------------------------------------------------
#                 mass  3398229.4 (±34.4%) i/s -   13962714 in   5.006538s
#         step by step  6655682.5 (±5.3%) i/s -   33210632 in   5.009689s