Declarations
Declarations are statements in programming that introduce identifiers (such as variables, functions, or classes) and define their properties, like type or scope, without necessarily executing any actions. They are fundamental to statically-typed languages and many modern frameworks, enabling code organization, type safety, and tooling support. This concept contrasts with imperative statements that perform operations.
Developers should understand declarations to write clean, maintainable code, especially in statically-typed languages like TypeScript or Java, where they enforce type checking and reduce runtime errors. They are essential for defining interfaces, modules, and data structures in frameworks like React or Angular, improving code readability and enabling features like autocompletion in IDEs. Use cases include declaring variables with `let` or `const` in JavaScript, defining function signatures, or specifying class properties in object-oriented programming.