Function isFn

isFn(instance): boolean
Checks if the provided instance is a function.
Parameters
- instance: unknown
  The instance to be checked.
Returns boolean
true if the instance is a function, false otherwise.
Example
```
const func = () => {};
const obj = {};

console.log(isFn(func)); // true
console.log(isFn(obj));  // false
```

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