js Promise thenable All In One

Any object that implements the then() method in this way is called a thenable.
All promises are thenables, but not all thenables are promises.

Promise.prototype.then()

const promise = new Promise((resolve, reject) => {
  resolve('Success!');
});

promise.then((value) => {
  console.log(value);
  // "Success!"
});

const p = new Promise();

p.then(onFulfilled[, onRejected]);

p.then(value => {
  // fulfillment
}, reason => {
  // rejection
});

refs

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise/then

https://cdn.xgqfrms.xyz/promise/understanding-javascript-promises.pdf

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