Some benchmarking using benchmark-ips on some common ruby methods

bm_ips.rb

# gem install benchmark-ips
# run irb

require "benchmark/ips"

n = 100_000

# Array#push vs Array#<<
#
# Results:
#
# Warming up --------------------------------------
#                 push    10.000  i/100ms
#                   <<    13.000  i/100ms
# Calculating -------------------------------------
#                 push    103.141  (± 3.9%) i/s -    520.000  in   5.050541s
#                   <<    133.237  (± 3.0%) i/s -    676.000  in   5.077262s
# Comparison:
#                   <<:      133.2 i/s
#                 push:      103.1 i/s - 1.29x slower
#
# Code
countries = []
VARIOUS_COUNTRY = "zz".freeze

Benchmark.ips do |r| 
  r.report('push') { n.times {countries.push(VARIOUS_COUNTRY)} }
  r.report('<<') { n.times {countries << VARIOUS_COUNTRY } }
  r.compare!
end