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			# wrappy

			Callback wrapping utility

			## USAGE

			```javascript
			var wrappy = require("wrappy")

			// var wrapper = wrappy(wrapperFunction)

			// make sure a cb is called only once
			// See also: http://npm.im/once for this specific use case
			var once = wrappy(function (cb) {
			var called = false
			return function () {
			if (called) return
			called = true
			return cb.apply(this, arguments)
			}
			})

			function printBoo () {
			console.log('boo')
			}
			// has some rando property
			printBoo.iAmBooPrinter = true

			var onlyPrintOnce = once(printBoo)

			onlyPrintOnce() // prints 'boo'
			onlyPrintOnce() // does nothing

			// random property is retained!
			assert.equal(onlyPrintOnce.iAmBooPrinter, true)
			```

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