Make a Hash

Many data types and structures exist – from simple strings and integers to multi-dimensional arrays. One of the most common and useful types is the simple growable array that can contain an arbitrary number of elements. You can basically put data in, look it up, and remove it as needed; this structure is also referred to as a one-dimensional array. Often, you can also insert an array as a data element into an existing array, giving you a multi-dimensional array that lets you do things like create a “customer” array with a number of elements containing a customer name, phone number, and so forth.