Yet another type detective – CoffeeScript version of the type `component/type` NPM package

type-yatd.coffee

#
# A less-broken `typeof` function. CoffeeScript version of the
# `component/type` NPM package [1].
#
# See also:
#
# [1] https://github.com/component/type/blob/master/index.js
# and https://gist.github.com/olange/2aa1abe1001c92bde78be1c84d7f1261
exp.type = (val) ->
  toString = Object.prototype.toString

  isBuffer = (obj) ->
    # // code borrowed from https://github.com/feross/is-buffer/blob/master/index.js
    return !!( obj? and \
      (obj._isBuffer \ # For Safari 5-7 (missing Object.prototype.constructor)
        or( obj.constructor \
             and typeof obj.constructor.isBuffer is "function" \
             and obj.constructor.isBuffer( obj))))

  switch toString.call(val)
    when "[object Date]" then return "date"
    when "[object RegExp]" then return "regexp"
    when "[object Arguments]" then return "arguments"
    when "[object Array]" then return "array"
    when "[object Error]" then return "error"

  return "null" if val is null
  return "undefined" if val is undefined
  return "nan" if val isnt val
  return "element" if val? and val.nodeType is 1
  return "buffer" if isBuffer( val)

  val = if val.valueOf? then val.valueOf() \
        else Object.prototype.valueOf.apply(val)

  return typeof val