terminator.ts

'use strict';

function log(type:string) {
	return function(target: any, key: string, descriptor: PropertyDescriptor) {
		let fn = descriptor.value;

		descriptor.value = function(...args:any[]) {
			console.log(`[${type.toLocaleUpperCase()}]: Invoking method - ${key}`);
			let result = fn.apply(this, args);
			console.log(`[${type.toLocaleUpperCase()}]: Completed method - ${key}`);
			return result;
		}
	}
}

class Person {
	name: string;
	constructor(name: string) {
		this.name = name;
	}

	@log('info')
	sayHello(name?:string) : string {
		return `Hello, ${name === '' ? 'world' : name}. I'm ${this.name}.`;
	}
}

const namesTuple:[string, string][] = [['sulu', 'kirk'], ['sarah', 'john'], ['leia', 'luke']];
namesTuple.forEach(([own, their]) => {
	let person = new Person(own);
	console.log(person.sayHello(their));
});