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Update benchmark with String#casecmp? example #188

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Jun 6, 2022
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Update benchmark with String#casecmp? example #188

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b485926
Update benchmark with `String#casecmp?` example
NARKOZ Dec 9, 2020
e896d22
Add a note about Unicode characters
NARKOZ Dec 9, 2020
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25 changes: 15 additions & 10 deletions README.md
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Expand Up @@ -1064,22 +1064,27 @@ Comparison:
String#dup: 3566485.7 i/s - 2.16x slower
```

##### `String#casecmp` vs `String#downcase + ==` [code](code/string/casecmp-vs-downcase-==.rb)
##### `String#casecmp` vs `String#casecmp?` vs `String#downcase + ==` [code](code/string/casecmp-vs-downcase-==.rb)

`String#casecmp?` is available on Ruby 2.4 or later.
Note that `String#casecmp` only works on characters A-Z/a-z, not all of Unicode.

```
$ ruby -v code/string/casecmp-vs-downcase-\=\=.rb
ruby 2.2.0p0 (2014-12-25 revision 49005) [x86_64-darwin14]

ruby 2.7.1p83 (2020-03-31 revision a0c7c23c9c) [x86_64-darwin19]
Warming up --------------------------------------
String#casecmp? 395.796k i/100ms
String#downcase + == 543.958k i/100ms
String#casecmp 730.028k i/100ms
Calculating -------------------------------------
String#downcase + == 101.900k i/100ms
String#casecmp 109.828k i/100ms
-------------------------------------------------
String#downcase + == 2.915M (± 5.4%) i/s - 14.572M
String#casecmp 3.708M (± 6.1%) i/s - 18.561M
String#casecmp? 3.687M (±10.9%) i/s - 18.602M in 5.158065s
String#downcase + == 5.017M (±11.3%) i/s - 25.022M in 5.089175s
String#casecmp 6.948M (± 6.0%) i/s - 35.041M in 5.062714s

Comparison:
String#casecmp: 3708258.7 i/s
String#downcase + ==: 2914767.7 i/s - 1.27x slower
String#casecmp: 6948231.0 i/s
String#downcase + ==: 5017089.5 i/s - 1.38x (± 0.00) slower
String#casecmp?: 3686650.7 i/s - 1.88x (± 0.00) slower
```

##### String Concatenation [code](code/string/concatenation.rb)
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5 changes: 5 additions & 0 deletions code/string/casecmp-vs-downcase-==.rb
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Expand Up @@ -2,6 +2,10 @@

SLUG = 'ABCD'

def slowest
SLUG.casecmp?('abcd')
end

def slow
SLUG.downcase == 'abcd'
end
Expand All @@ -11,6 +15,7 @@ def fast
end

Benchmark.ips do |x|
x.report("String#casecmp?") { slowest } if RUBY_VERSION >= "2.4.0".freeze
x.report('String#downcase + ==') { slow }
x.report('String#casecmp') { fast }
x.compare!
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