8_bugs_and_errors/retry.js

class MultiplicatorUnitFailure extends Error {}

function primitiveMultiply(a, b) {
	if (Math.random() < 0.2) {
		return a * b;
	} else {
		throw new MultiplicatorUnitFailure('Klunk');
	}
}

function reliableMultiply(a, b) {
	for (;;) {
		try {
			return primitiveMultiply(a, b);
		} catch (e) {
			if (!(e instanceof MultiplicatorUnitFailure)) throw e;
		}
	}
}

console.log(reliableMultiply(2, 5));