Description: The Function Decorator is a design pattern that allows adding behavior to individual functions in a flexible and reusable way. This pattern is based on the idea of wrapping an existing function with another function that can modify its behavior, whether by adding functionalities, performing validations, or altering its output. In programming languages like TypeScript and Python, decorators are a powerful feature that allows developers to apply modifications to functions or methods without changing their original code. This is achieved through the use of higher-order functions, which take a function as an argument and return a new function. Decorators are especially useful in aspect-oriented programming, where the goal is to separate concerns in code, such as logging, authentication, or performance measurement. Their use promotes code cleanliness and modularity, making maintenance and understanding easier. In summary, the Function Decorator is an essential tool in a developer’s toolbox, allowing for elegant and efficient functionality extension.
Uses: Decorators are used in various applications, such as data validation, permission management, activity logging, and cache implementation. In programming languages, they are commonly used to modify functions and methods, allowing for functionality addition without altering the base code.
Examples: An example in Python would be a decorator that measures the execution time of a function. In TypeScript, a class decorator could be used to define a component in a framework, where metadata such as the selector and template of the component are specified.
