What is the difference between polyfills and feature detection?

What is the difference between polyfills and feature detection?

Polyfills are scripts that provide modern functionality on older browsers, while feature detection checks if a browser supports a feature before using it.

Can you give me an example of a polyfill?

Sure! A common example is the 'fetch' polyfill, which allows older browsers to use the Fetch API for network requests.

How does feature detection work in practice?

Feature detection typically uses JavaScript to check if a feature exists, like using 'if (typeof Promise !== 'undefined')' to see if Promises are supported.

Which approach is better for ensuring compatibility?

It depends on your needs. Polyfills ensure functionality but can increase load times, while feature detection allows for more efficient code execution.

Are there any downsides to using polyfills?

Yes, polyfills can bloat your code and may not always work perfectly across all browsers, leading to potential issues.