Promise.resolve(1).then(val => {
console.log(val);
return val + 1;
}).then(val => {
console.log(val);
});0
What will be the output of the following JavaScript Promise code and how does it work?
kallyani
easy
3completed
65
Answer
1
2Explanation
Promise.resolve(1)creates a promise that is already resolved with the value1.- The first
.then()receivesval = 1. - It logs
1 - Returns
val + 1, which is2
- It logs
- When a value is returned from
.then(), it is automatically wrapped in a resolved promise. - The second
.then()receives the returned value2. - It logs
2
- It logs
Key Points
- Each
.then()receives the value returned from the previous.then() - Returning a value from
.then()passes it to the next.then() - Promises allow value chaining
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