Slice string every 10th character

slice.rb

require 'benchmark'

def usescan(input)
  input.each do |s|
    a = s.scan(/.{1,10}/)
  end
end

def useslice(input)
  input.each do |s|
    a = s.each_char.each_slice(10).map(&:join)
  end
end

srand(1)
input = Array.new(10) do
  s = ""
  1000000.times do
    s << (rand*10).to_i.to_s
  end
  s
end

r1 = Benchmark.realtime do
  usescan(input)
end

r2 = Benchmark.realtime do
  useslice(input)
end

puts "scan #{r1} [sec]"  # => scan 0.34344600001350045 [sec]
puts "slice #{r2} [sec]" # => slice 2.0583080000360496 [sec]