Promise that can be resolved with multiple values.

MPromise.js

class MPromise extends Promise {
  constructor(executor) {
    super((resolve, reject) =>
      executor((...args) => resolve(args), (...args) => reject(args))
    );
  }

  then(onFulfilled, onRejected) {
    return super.then(
      onFulfilled ? (args) => onFulfilled(...args) : undefined,
      onRejected ? (args) => onRejected(...args) : undefined
    );
  }

  catch(onRejected) {
    return super.catch((args) => onRejected(...args));
  }
}


// Sample:
function getHelloWorld() {
  return new MPromise((resolve, reject) => {
    resolve('Hello', 'World');
    // or reject with multiple arguments
    // reject(new Error('Not Found'), 'Hello', 'World');
  });
}

getHelloWorld().then((h, w) => {
  console.log(`H is: ${h}, W is: ${w}`);
}).catch((error, h, w) => {
  console.log(`Error: ${error}: ${h}, ${w}`);
});