A super simple promise queue in pure JavaScript. The slogan:
Inspiration: ThePrimeagean mentioned a few times that one of his favorite questions to ask on interview to validate if a person understands how Promises work is implementing a promise queue. I doubt I will ever be interviewed by him but it sounded like a great mini challenge.
const p1 = () => new Promise((resolve, reject) => {
setTimeout(resolve, 1000, 'hello')
});
const p2 = () => new Promise((resolve, reject) => {
setTimeout(resolve, 100, 'world')
});
// only allow one Promise to run at a time
const promiseLane = new PromiseLane(1);
const w1 = promiseLane.add(p1);
const w2 = promiseLane.add(p2);
w1.then((v) => console.log(v));
w2.then((v) => console.log(v));
// Output:
// hello
// world-
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