compare_branching.jl

function f1(N::Int)
  s = 0
  for n = 1:N
    n % 2 == 0 && (s += 2; continue)
    s += 1
  end
  s
end

function f2(N::Int)
  s = 0
  for n = 1:N
    s += ifelse(n%2==0, 2, 1)
  end
  s
end

function f3(N::Int)
  s = 0
  for n = 1:N
    s += n%2 == 0 ? 2 : 1
  end
  s
end

function f33(N::Int)
  s = 0
  for n = 1:N
    n%2 == 0 ? s += 2 : s += 1
  end
  s
end

function f4(N::Int)
  s = 0
  for n = 1:N
    if n%2 == 0
      s+=2
    else
      s+=1
    end
  end
  s
end

using BenchmarkTools

pass = true
K = 0
for K in [99, 100, 100000]
  print(" short circuit ($K): ")
  a1= @btime f1($K)

  print("        ifelse ($K): ")
  a2= @btime f2($K)

  print(" tertiary op ? ($K): ")
  a3= @btime f3($K)

  print(" alternative ? ($K): ")
  a33= @btime f33($K)

  print("     branching ($K): ")
  a4= @btime f4($K)

  println()

  pass = pass && (a1==a2==a3==a33==a4)
end

pass && println("same results")