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Commit 36296ef

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Fixes the 'planets align' condition of select.last vs reverse.detect (#233)
* Update select.last example * Fixes world aligns condition
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‎README.md‎

Lines changed: 13 additions & 9 deletions
Original file line numberDiff line numberDiff line change
@@ -655,18 +655,22 @@ Enumerable#select.first: 89757.4 i/s - 4.84x slower
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```
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$ ruby -v code/enumerable/select-last-vs-reverse-detect.rb
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ruby 2.2.0p0 (2014年12月25日 revision 49005) [x86_64-darwin14]
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ruby 3.4.2 (2025年02月15日 revision d2930f8e7a) +PRISM [arm64-darwin23]
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ruby 3.4.2 (2025年02月15日 revision d2930f8e7a) +PRISM [arm64-darwin23]
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Warming up --------------------------------------
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Enumerable#reverse.detect
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8.821k i/100ms
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Enumerable#select.last
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385.000 i/100ms
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Calculating -------------------------------------
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Enumerable#reverse.detect 62.636k i/100ms
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Enumerable#select.last 11.687k i/100ms
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-------------------------------------------------
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Enumerable#reverse.detect 1.263M (± 8.2%) i/s - 6.326M
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Enumerable#select.last 119.387k (± 5.7%) i/s - 596.037k
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Enumerable#reverse.detect
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96.317k (± 6.8%) i/s (10.38 μs/i) - 485.155k in 5.060103s
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Enumerable#select.last
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3.839k (± 1.2%) i/s (260.49 μs/i) - 19.250k in 5.015198s
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Comparison:
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Enumerable#reverse.detect: 1263100.2 i/s
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Enumerable#select.last: 119386.8 i/s - 10.58x slower
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Enumerable#reverse.detect: 96316.5 i/s
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Enumerable#select.last: 3838.9 i/s - 25.09x slower
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```
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##### `Enumerable#sort` vs `Enumerable#sort_by` [code](code/enumerable/sort-vs-sort_by.rb)

‎code/enumerable/select-last-vs-reverse-detect.rb‎

Lines changed: 3 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -1,13 +1,13 @@
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require 'benchmark/ips'
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ARRAY = [*1..100]
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ARRAY = [*1..7777]
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def fast
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ARRAY.reverse.detect { |x| (x % 10).zero? }
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ARRAY.reverse.detect { |x| (x % 5).zero? }
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end
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def slow
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ARRAY.select { |x| (x % 10).zero? }.last
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ARRAY.select { |x| (x % 5).zero? }.last
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end
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Benchmark.ips do |x|

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