any vs length > 0

any_vs_length.rb

require 'benchmark'

a = []
iterations = 1_000_000
puts "for empty array"

Benchmark.bm do |x|
    x.report("length") { iterations.times do; a.length > 0; end }
    x.report("any") { iterations.times do; a.any?; end }
end

#       user     system      total        real
#length  0.030000   0.000000   0.030000 (  0.038053)
#any  0.040000   0.000000   0.040000 (  0.056048)

puts "for full array"
b =  (1..100).to_a

Benchmark.bm do |x|
    x.report("length") { iterations.times do; b.length > 0; end }
    x.report("any") { iterations.times do; b.any?; end }
end

#       user     system      total        real
#length  0.040000   0.000000   0.040000 (  0.039192)
#any  0.050000   0.000000   0.050000 (  0.056181)