JS function behind the scenes

function.js

// Every time you define a function it's as if all this happens behind the scenes...

function foo() {
    // var arguments = new array-like object corresponding to the function arguments
    // foo.length = number of parameters in function definition (different from arguments.length);
    // foo.name = 'foo';
    // foo.prototype = {};
    // foo.constructor = Function;

    //// (only if no explicit return statement exists and is not invoked with 'new' operator)
    // return undefined;
}