Javascript: Promise

Source: https://www.geeksforgeeks.org/javascript-promises/

Promise is easier than callback because code is readable in promise. Promise has also a method. Methods: then, catch, finally (these methods use callback)
Benefits of Promises

Improves Code Readability
Better handling of asynchronous operations
Better flow of control definition in asynchronous logic
Better Error Handling

A Promise has four states:

fulfilled: Action related to the promise succeeded
rejected: Action related to the promise failed
pending: Promise is still pending i.e not fulfilled or rejected yet
settled: Promise has fulfilled or rejected

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