Example 5-12. Promise callback breaks up the call stack

function echo(text) {
	console.log(text);
	throw new Error('oops');
	// Example of call stack for error when invoked as a callback for a promise
	// echo (line:3)
}

function showRandomNumber() {
	// Invoking echo as a promise callback
	var p = Promise.resolve(Math.random());
	p.then(echo).catch(function (error) {
		console.log(error.stack)
	});
}

document.addEventListener('click', function handleClick() {
	showRandomNumber();
});

document.addEventListener('keypress', function handleKeypress() {
	showRandomNumber();
});