Checks types.
var is = require('isita'); is.array([]) is.date(new Date) is.null(null) is.color(0xFFFFFF) is.function(is.function)
etc.
Supported:
- nan
- array
- date
- regexp
- number
- string
- boolean
- function
- undefined
- null
- integer
- positive
- negative
- finite
- natural
- color