#3 - Promises

Javascript promise is an object that acts as a proxy for an asynchronous function that is supposed to complete at some point. Promise supports the non-blocking asynchronous operations in javascript. So, with promises, the code doesn’t block, and the promise eventually returns a value.

A promise may exist in any of the three states.

• Pending: Initial state; neither fulfilled nor rejected
• Fulfilled: When the operation completes successfully
• Rejected: When the operation fails

Source

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

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const IPromise = new Promise((resolve,reject)=>{

    setTimeout(()=>{

        resolve("Hello");

    },300);

});

//Output : Hello World

IPromise

.then(value=>{return value + " World"})

.then(value=>{console.log(value)})

.catch(err => {console.log(err)});