mhm13dev

Promises and observables are both mechanisms used in JavaScript for handling asynchronous operations, but they have different characteristics and usage patterns.

Promises:

• Promise is an object representing the eventual completion or failure of an asynchronous operation and its resulting value.
• It has states: pending (initial state), fulfilled (operation completed successfully), or rejected (operation failed).
• A Promise can be created using the new Promise() constructor, taking a function with resolve and reject parameters.
• It provides a cleaner way to write asynchronous code compared to callbacks, allowing chaining of .then() and .catch() methods.
• .then() is used to handle the resolved value, and .catch() is used to catch any errors.
• Promises are not cancellable, and once settled (fulfilled or rejected), they remain in that state.

mhm13dev

// for multiple requests
let isRefreshing = false;
let failedQueue = [];

const processQueue = (error, token = null) => {
  failedQueue.forEach(prom => {
    if (error) {
      prom.reject(error);
    } else {
      prom.resolve(token);

mhm13dev

See this answer on Stack Overflow:

https://stackoverflow.com/a/3042512/6537026

mhm13dev

Read this article:

https://www.freecodecamp.org/news/manage-multiple-github-accounts-the-ssh-way-2dadc30ccaca/

For questions, comment below!

mhm13dev

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