pascalCase

PascalCase is a naming convention in programming where multi-word identifiers are formed by concatenating the words and capitalizing the first letter of each word, with no separators such as spaces, underscores, or hyphens. It is also referred to as UpperCamelCase. The style contrasts with camelCase, in which the first letter of the identifier is lowercase.

Usage and examples: PascalCase is commonly used for naming types, classes, interfaces, and namespaces in various languages. Examples include CustomerOrder, HttpRequest, XmlDocument, and UserProfile. In many languages, class names and type names favor PascalCase, while other naming conventions may apply to variables, methods, or properties.

Variations and considerations: Some style guides differ on how to treat acronyms and initialisms within PascalCase. For instance, some guidelines prefer XmlDocument or HttpServer, while others favor XMLDocument or HTTPServer for four-letter acronyms. The choice often depends on language or project conventions. Regardless, the core rule remains: no separators, and each word begins with a capital letter.

Relation to other conventions: PascalCase is often contrasted with camelCase, where the first character is lowercase (e.g., userProfile). It is compatible with many language ecosystems; in Java, class names typically use PascalCase, as do many C# constructs such as class names and method names (where applicable). The term derives from the Pascal programming language, reflecting its long-standing influence on naming practices in software development.