> You get to the end and all of a sudden the }(); With most code conventions, you wrap immediately invoked function expressions (IIFEs) in parens: var foo =

> You get to the end and all of a sudden the }(); With most code conventions, you wrap immediately invoked function expressions (IIFEs) in parens: var foo = (function () { ... }()); The only purpose of those extra parens is to act as marker. Well, with block scope (`let` & `const`), IIFEs aren't really needed anymore.