promise-utilities
A collection of helper methods based on promises
Utility Functions
1. promisify
promisify is very useful method to create a promise and resolve it later.
Usage
const [promise, resolver] = promisify();
promise.then(() => {
console.log('this promise is resolved');
});
....
resolver(); // Also pass a value for above subscription.2. promisedPubSub
promisedPubSub is another useful method to create a pub-sub model out of promises.
Usage
const [promise, resolver] = promisedPubSub();
function Method1() {
return promise.then((val) => {
console.log('subscriber 1', val);
});
}
function Method2() {
return promise.then((val) => {
console.log('subscriber 2', val);
});
}
const unsubscribeMeth1 = Method1();
const unsubscribeMeth2 = Method1();
....
resolver('value 1'); // logs subscriber 1 value 1, subscriber 2 value 1
resolver('value 2'); // logs subscriber 1 value 2, subscriber 2 value 2
unsubscribeMeth1();
resolver('value 3'); // logs subscriber 2 value 3