implement Promise.prototype.finally()

Question

Promise.prototype.finally() could be used to run a callback when a promise is settled(either fulfilled or rejected).

Notice that the callback passed finally() doesn't receive any argument, meaning it doesn't modify the value in the promise chain (care for rejection).

Code

/**
 * @param {Promise<any>} promise
 * @param {() => void} onFinally
 * @returns {Promise<any>}
 */
function myFinally(promise, onFinally) {
  // your code here
}

Source

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