How do I use method decorators in TypeScript?

Can you explain what method decorators are in TypeScript?

Sure! Method decorators are special functions that can be applied to a method in a class to modify its behavior or add additional functionality.

How do I create a simple method decorator?

You can create a method decorator by defining a function that takes three parameters: the target object, the method name, and the property descriptor. Here's a basic example:

function log(target: any, propertyName: string, descriptor: PropertyDescriptor) {
    const originalMethod = descriptor.value;
    descriptor.value = function(...args: any[]) {
        console.log(`Calling ${propertyName} with arguments: ${args}`);
        return originalMethod.apply(this, args);
    };
}

Can you show me how to use that decorator in a class?

Absolutely! Here's how you can use the log decorator in a class:

class Example {
    @log
    sayHello(name: string) {
        return `Hello, ${name}!`;
    }
}

const example = new Example();
console.log(example.sayHello('Alice'));

What are some common use cases for method decorators?

Common use cases include logging method calls, measuring execution time, enforcing access control, and modifying method parameters or return values.