Whilst working on a recent project, I wanted an accordion navigation to remain open depending on what the category segment in the url was displaying.

Wrap your code in an immediately invoked function expression (IFFE). It runs immediately when you create it and has no name.

JavaScript objects are used everywhere. It's an important concept to understand right from the beginning.

You can pass arguments into functions to be used within the function. These arguments can be any JavaScript data type including functions.

Use a constructor function that returns an object. You can then create multiple people passing in the first and last name arguments the `createPerson` function.

This example shows how you create a closure in JavaScript it uses an alert function that can be incremented and reused/passed around.