A unary function is a mathematical or programming function that takes exactly one argument. In programming, a unary function typically takes a single argument and produces a corresponding output. Let's explore a unary function with an example in JavaScript: Example: Unary Function in JavaScript
``````
// Unary function to square a number
function square(x) {
return x * x;
}

// Usage of the unary function
const number = 5;
const result = square(number);
console.log(result); // Output: 25
```
```
In this example, we have a unary function called `square` that takes a single argument `x`. The function calculates the square of the input number by multiplying `x` with itself and returns the result. When we call the function with `number` set to 5, it calculates the square (5 * 5) and returns 25, which is then printed to the console. Conclusion: As you can see, a unary function is a simple function that operates on a single argument, performing some computation, and returning the output. Unary functions are commonly used in various programming tasks, especially in functional programming paradigms, where operations on single values are frequent.