The Essential Guide to Using Promise in JavaScript | HackerNoon

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The Essential Guide to Using Promise in JavaScript | HackerNoon
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'The Essential Guide to Using Promise in JavaScript' by taimoorsattar7 javascript promise

to retrieve the data from a certain API endpoint. The fetch in JavaScript is a promise that returns the data if the request is successfully processed.

Let's take an example. We have 1st person that's giving the promise and 2nd person that's waiting for the promise to fulfill.const myPromise=new Promise=> { setTimeout=> { if > 0.5){ resolve; }else{ reject } }, 300); }); In the above, we define the promise that waits for 0.3 seconds and returns the pass or fails message based on the boolean logic .myPromise myPromise .then .then }) .catch }) .finally=> { console.log; });: Executes when the process is successfully completedMoving further... Let's say, we have more than one person that is giving the promise. We can define in JavaScript as below:Promise.all

that returns a promise which resolves after all of the given promises have either been fulfilled or rejected. We can write in JavaScript as below:The above code will log the following in the console:The previous example works OK if all the promises resolve successfully. But... let's say, If one of the promises is rejected, the overallLet say, If we are waiting for many promises. Some promises got fulfilled and some are rejected.

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