In JavaScript, what does a Promise represent, and how does async/await affect code readability?

In JavaScript, what does a Promise represent, and how does async/await affect code readability?

• A. A Promise is a type of variable; async/await is a syntax error.
• B. A Promise represents a value that will be available in the future; async/await makes asynchronous code look synchronous.
• C. A Promise is a memory management feature; async/await handles garbage collection.
• D. A Promise is a UI component; async/await uses event loops.

Answer: (B)

A Promise represents a value that will be available in the future. In JavaScript, a Promise is an object that tracks the outcome of an asynchronous operation and can end up in one of three states: pending, fulfilled with a resulting value, or rejected with an error. You interact with promises by attaching handlers (then and catch) or by using async/await, which is where readability comes in.

Async/await makes asynchronous code look and feel more like synchronous code. An async function returns a Promise, and inside that function you can place await before a promise expression. Await pauses the function’s execution until that promise settles, then yields the resolved value, or throws the error if the promise rejects. This leads to a linear, try/catch-based flow instead of chaining multiple then calls, which often makes complex asynchronous logic easier to read and reason about.

In short, a Promise is about the future value of an asynchronous operation, and async/await provides a cleaner, more readable way to work with that future value.