// Method decorator that rounds all number arguments

function rounded(target: Object, name: string, descriptor: PropertyDescriptor) {

const originalFunction = descriptor.value

// Rewrite the property descriptor to a new function that wraps the original

descriptor.value = function(...args: number[]) {

args = args.map((arg) => Math.round(arg))

// Call the original function

return originalFunction.apply(null, args)

}

}

class Adder {

// Try commenting the decorator

@rounded

add(...values: number[]) {

return values.reduce((a, b) => (a + b), 0)

}

}

const adder = new Adder()

console.log(adder.add(1.1, 2.8, 2.4))

Method decorators