Functional programming with arrays Although JavaScript’s arrays are very capable out of the box, the functional paradigm improves the clarity and maintainability of array code.

Built-in JavaScript objects and functions are ones you'll use all the time. Here's how to use Object, JSON, String, Math, Date, and console in your JavaScript programs.

Finally, you create a for () loop to cycle through the array and assign each one of them to the Image () object, thus preloading it into the cache. The onLoad () event handler ...