Node.js JavaScript syntax

2018-05-29 11:03:22

This question already has an answer here:

How do JavaScript closures work? 88 answers

What do parentheses surrounding an object/function/class declaration mean? [duplicate] 7 answers

This is a self invoking anonymous function. This pattern is useful when you want to hide variables from the global namespace.

(function(){
    var foo = "foo";
})();

console.log(window.foo); // undefined

Also see What do parentheses surrounding a JavaScript object/function/class declaration mean?

What advantages does using (function(window, document, undefined) { … })(window, document) confer?

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