Detect Internet Explorer version in Coffeescript. Returns IE version number if true, otherwise returns false.

gistfile1.coffee

window.dammitIE = do ->
	
	is_internet_explorer = ->
		window.navigator.appName is "Microsoft Internet Explorer"

	get_internet_explorer_version = ->
		matches = new RegExp(" MSIE ([0-9].[0-9]);").exec(window.navigator.userAgent)
		return parseInt(matches[1].replace(".0", "")) if matches? and matches.length > 1
		true

	return get_internet_explorer_version() if is_internet_explorer()
	false