Closure speeds: Result: 0.5260329246520996 0.656851053237915 0.5118138790130615

gistfile1.jl

begin
  local y::Vector{Int64} = zeros(Int64, 1000000)
  global demo2
  function demo2()
    x = y
    for ii in 1:1000000
      @inbounds x[ii] += 3
    end
    return x
  end
end

begin
  local y::Vector{Int64} = zeros(Int64, 1000000)
  global demo2slow
  function demo2slow()
    for ii in 1:1000000
      @inbounds y[ii] += 3
    end
    return y
  end
end

bar = zeros(Int64, 1000000)

function demo3(bar)
	for ii in 1:1000000
		@inbounds bar[ii] += 3
	end
	return bar
end

start = time()
for i = 1:500 
  demo2()
end
println(time() - start)

start = time()
for i = 1:500 
  demo2slow()
end
println(time() - start)

start = time()
for i = 1:500 
  demo3(bar)
end
println(time() - start)