What is the difference between JavaScript polyfills and transpilers?

What is the difference between JavaScript polyfills and transpilers?

JavaScript polyfills are scripts that provide modern functionality on older browsers, while transpilers convert modern JavaScript code into an older version.

Can you give me an example of a polyfill?

Sure! A common polyfill is the 'Array.prototype.includes' method, which allows you to check if an array includes a certain value.

What about a transpiler? How does it work?

A transpiler, like Babel, takes modern JavaScript (ES6+) and converts it into ES5 code, ensuring compatibility with older browsers.

When should I use a polyfill instead of a transpiler?

Use a polyfill when you need to add specific features to older browsers, and a transpiler when you want to write modern code that needs to run in those environments.

Are there any downsides to using polyfills or transpilers?

Yes, polyfills can increase load time and transpilers can sometimes lead to larger bundle sizes or performance issues if not configured properly.