iterate urls with fetch and generators

iterateGenerator.js

function executeGenerator(generator, yieldValue) {
	let next = generator.next(yieldValue);

	if (!next.done) {
		next.value.then(
			result => executeGenerator(generator, result),
			err => generator.throw(err)
		);
	} else {
		// catch return of generator
		console.log(next.value);
	}
}
function* testGen() {
	const url = 'https://yesno.wtf/api'

	let res1 = yield fetch(url).catch(err => console.log('fetch catch err ' + err))
	let res2 = yield fetch(`${url}?param1=${res1.ok}`).catch(err => console.log('fetch catch err ' + err))
	let res3 = yield fetch(`${url}?param1=${res1.ok}&param2=${res2.ok}`).catch(err => console.log('fetch catch err ' + err))

	return 'end'
}

executeGenerator(testGen())