While going through the Redux middleware, I have come across Axios which is 'Promise-based HTTP client' to make Ajax request from browser. Could any body explain about this term and some info about axios?
3 Answers
Before Promise's comes into the picture there is something called Callback to handle asynchronous calls/code. But the main issue with callback is that when it gets nested and more nested it becomes very messy code and harder to understand even for the writer of the code.
To make it bit cleaner Promise comes into the picture which is cleaner in nature, Avoid callback hell problem in nodejs programming.
Moreover the concept async/await is also best fit with the promise instead of callback.
Hope you understand now. Comment below in case of any doubt.
From MDN:
A
Promiseis a proxy for a value not necessarily known when the promise is created. It allows you to associate handlers with an asynchronous action's eventual success value or failure reason. This lets asynchronous methods return values like synchronous methods: instead of immediately returning the final value, the asynchronous method returns a promise to supply the value at some point in the future.A
Promiseis in one of these states:
- pending: initial state, neither fulfilled nor rejected.
- fulfilled: meaning that the operation was completed successfully.
- rejected: meaning that the operation failed.
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