require 'benchmark/ips'

N = 1_000_000
ARRAY = N.times.map { rand }

Benchmark.ips do |x|
  x.report("reject") do
    arr = ARRAY.dup
    out = []
    arr.reject! { _1 >= 0.5 }
    arr.each { out << _1 }
  end

  x.report("next") do
    arr = ARRAY.dup
    out = []
    arr.each { next if _1 >= 0.5; out << _1 }
  end
  x.hold! 'temp_results'
  x.compare!
end