Ruby: try vs &.

benchmark.rb

# frozen_string_literal: true

require 'benchmark/ips'
require 'memory_profiler'

p '=== Memory when using `try` ==='

report = MemoryProfiler.report do
  nil.try(:a)
end

report.pretty_print

p '=== Memory when using `&.` ==='

report = MemoryProfiler.report do
  nil&.a
end

report.pretty_print

Benchmark.ips do |x|
  x.report('try') { nil.try(:a) }
  x.report('&.') { nil&.a }

  x.compare!
end

Output.txt

"=== Memory when using `try` ==="
Total allocated: 40 bytes (1 objects)
Total retained:  0 bytes (0 objects)

allocated memory by gem
-----------------------------------
        40  other

allocated memory by file
-----------------------------------
        40  test.rb

allocated memory by location
-----------------------------------
        40  test.rb:8

allocated memory by class
-----------------------------------
        40  Array

allocated objects by gem
-----------------------------------
         1  other

allocated objects by file
-----------------------------------
         1  test.rb

allocated objects by location
-----------------------------------
         1  test.rb:8

allocated objects by class
-----------------------------------
         1  Array

retained memory by gem
-----------------------------------
NO DATA

retained memory by file
-----------------------------------
NO DATA

retained memory by location
-----------------------------------
NO DATA

retained memory by class
-----------------------------------
NO DATA

retained objects by gem
-----------------------------------
NO DATA

retained objects by file
-----------------------------------
NO DATA

retained objects by location
-----------------------------------
NO DATA

retained objects by class
-----------------------------------
NO DATA

"=== Memory when using `&.` ==="
Total allocated: 0 bytes (0 objects)
Total retained:  0 bytes (0 objects)

allocated memory by gem
-----------------------------------
NO DATA

allocated memory by file
-----------------------------------
NO DATA

allocated memory by location
-----------------------------------
NO DATA

allocated memory by class
-----------------------------------
NO DATA

allocated objects by gem
-----------------------------------
NO DATA

allocated objects by file
-----------------------------------
NO DATA

allocated objects by location
-----------------------------------
NO DATA

allocated objects by class
-----------------------------------
NO DATA

retained memory by gem
-----------------------------------
NO DATA

retained memory by file
-----------------------------------
NO DATA

retained memory by location
-----------------------------------
NO DATA

retained memory by class
-----------------------------------
NO DATA

retained objects by gem
-----------------------------------
NO DATA

retained objects by file
-----------------------------------
NO DATA

retained objects by location
-----------------------------------
NO DATA

retained objects by class
-----------------------------------
NO DATA

Warming up --------------------------------------
                 try   692.520k i/100ms
                  &.     2.685M i/100ms
Calculating -------------------------------------
                 try      7.960M (± 1.5%) i/s -     40.166M in   5.047144s
                  &.     27.077M (± 1.6%) i/s -    136.958M in   5.059503s

Comparison:
                  &.: 27076505.4 i/s
                 try:  7960082.8 i/s - 3.40x  (± 0.00) slower