negation plus cast to boolean. See this for more info: https://stackoverflow.com/questions/21154510/the-use-of-the-triple-exclamation-mark https://stackoverflow

negation plus cast to boolean. See this for more info: https://stackoverflow.com/questions/21154510/the-use-of-the-triple-exclamation-mark https://stackoverflow.com/questions/21154510/the-use-of-the-...