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akshay-vishnoi/many_performance.rb

Last active December 31, 2015 17:49
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Performance Increase in #many?
Raw
many_performance.rb
require 'benchmark/ips'
def old_many?(enum)
cnt = 0
enum.any? { (cnt += 1) > 1 }
end
def new_many?(enum)
enum.count > 1
end
enum = (1..1000).to_a
Benchmark.ips do |b|
b.report('old') do
old_many? enum
end
b.report('new') do
new_many? enum
end
end
# Output
# Calculating -------------------------------------
# old 57932 i/100ms
# new 93881 i/100ms
# -------------------------------------------------
# old 1312923.5 (±3.1%) i/s - 6604248 in 5.035705s
# new 4991185.8 (±3.2%) i/s - 24972346 in 5.009269s
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