Categorical values are typically represented in mrScriptBasic in a manner that is not valid JavaScript (for example, {north} or {8}). The values can be enclosed in quotation marks (for example, "{north}"), but this solution introduces the problem of determining whether the value is a string or a categorical. To resolve this problem, categorical values are represented with a Categorical object.

Internally, the Categorical stores category names as String objects in an Array object. The strings are always stored in lowercase, and are converted to lowercase before comparison. The Categorical class is designed to represent categories as strings that hold the category name. The class can not convert between category names and category values, like the CDMVariant class, because it does not have a category map. This means that category operations are slower because they operate on strings rather than numbers. The difference is important during data processing operations, but is not a significant consideration on mobile devices that only conduct interviews.

Operators are represented as methods because JavaScript does not support operator overloading.