_.mixin(
  isBlank: (obj) ->
    if _.isString(obj)
      !obj.match(/\S/)?
    else if _.isBoolean(obj)
      if obj then false else true
    else if _.isNumber(obj)
      false
    else
      # fall through to `isEmpty` which will
      # handle objects, arrays, null & undefined
      _.isEmpty(obj)
)