Programming in CoffeeScript: Existential Operator Tips

hi everybody mark Bates here i'm the author of programming and coffee script and i've got a few tips for you today i'd like to share the first tip we're going to talk about is existential operator in CoffeeScript a lot of times we're developing applications as developers we need to check to make sure that something exists and if it exists then we want to do something with it so you know we'll say okay well if you know my variable few exists then I w...