Which of the following is NOT a characteristic of a function in JavaScript?

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In JavaScript, functions are highly flexible and don't require a specific return type, which aligns with the concept of dynamic typing in the language. This means a function can return values of different types or nothing at all. For example, a function can return a number, a string, an object, or simply execute without returning anything (implicitly returning undefined).

The other characteristics listed are indeed true for functions in JavaScript. Functions can be invoked multiple times, allowing for code reuse and modular design. They can accept parameters, enabling them to be generalized and tailored for various inputs. Additionally, functions can contain other functions, facilitating the creation of higher-order functions and closures, which are pivotal concepts in JavaScript programming. These characteristics contribute to JavaScript's versatility and the functional programming paradigm it supports.