Initializing array by push or block

push.rb

require 'benchmark'

def use_push(size,trial)
  trial.times do  
    a = []
    size.times do |i|
      a.push i
    end
  end
end

def use_block(size,trial)
  trial.times do  
    a = Array.new(size){|i| i}
  end
end

SIZE=1000
TRIAL=10000
r1 = Benchmark.realtime do
  use_push(SIZE,TRIAL)
end

r2 = Benchmark.realtime do
  use_block(SIZE,TRIAL)
end

puts "push  #{r1} [sec]" # => push  0.6004580000007991 [sec]
puts "block #{r2} [sec]" # => block 0.3890559999999823 [sec]