A console.time implementation in CoffeeScript

console.time.coffee

if window.console and typeof(window.console.time) is "undefined"

  console.timeKey = (name) ->
    return unless name
    "KEY:" + name.toString()

  console.time = (name, reset=false) ->
    console.timeCounters ||= {}

    return unless key = console.timeKey(name)
    return if not reset and console.timeCounters[key]?

    console.timeCounters[key] = new Date().getTime()

  console.timeEnd = (name) ->
    return unless key = console.timeKey(name)

    if start = console.timeCounters?[key]
      diff = new Date().getTime() - start
      console.info "#{name}: #{diff}ms"
      delete console.timeCounters[key]

    return diff