Data in JavaScript is often represented by an array, and so one tends to manipulate arrays when visualizing or analyzing data. Some common forms of manipulation include taking a contiguous slice (subset) of an array, filtering an array using a predicate function, and mapping an array to a parallel set of values using a transform function.

Before looking at the set of utilities that this module provides, familiarize yourself with the powerful array methods built-in to JavaScript.

Node.js is an event-based server-side JavaScript engine.