timeit.js

const timeIt = R.curry((report, f) => (...args) => {
  
  const t0 = Date.now()
  const nArgs = R.init(args)
  const callback = R.last(args)
  
  nArgs.push((...args)  => {
    const t1 = Date.now()
    callback(...args)
    report(t1 - t0, ...args)
  })
  
  f(...nArgs)
  
})

const timeIt1 = timeIt(
  (t, err, res) => console.log(`Log: ${err || res} produced after: ${t}`)
)

const calc = (x, y, z, callback) =>
  setTimeout(() => callback(null, x * y / z), 1000)


calc(18, 7, 3, (err, res) => console.log(err || res))

timeIt1(calc)(18, 7, 3, (err, res) => console.log(err || res))