" performance comparison of 'with function' and 'without function'

function! s:Function1(i)
  return a:i % 2 == 0 ? 'even' : 'odd'
endfunction

function! s:Function2(i)
  if a:i % 2 == 0
    return 'even'
  else
    return 'odd'
  endif
endfunction

function! s:Main()
  let max = 1000000

  " without function
  let i = 0
  let start = reltime()
  while i < max
    let hoge = i % 2 == 0 ? 'even' : 'odd'
    let i += 1
  endwhile
  echo 'without function  : ' . reltimestr(reltime(start))

  " with function 1
  let i = 0
  let start = reltime()
  while i < max
    let hoge = <SID>Function1(i)
    let i += 1
  endwhile
  echo 'with    function1 : ' . reltimestr(reltime(start))

  " with function 2
  let i = 0
  let start = reltime()
  while i < max
    let hoge = <SID>Function2(i)
    let i += 1
  endwhile
  echo 'with    function2 : ' . reltimestr(reltime(start))
endfunction

execute <SID>Main()