How can I implement feature detection in JavaScript?

How can I implement feature detection in JavaScript?

You can use the Modernizr library or check for specific features using conditional statements. What feature are you interested in?

I'm interested in detecting if the browser supports WebSockets.

You can check for WebSocket support by using the following code: if ('WebSocket' in window) { /* supported */ } else { /* not supported */ }.

Are there any other features I should consider detecting?

Yes, you might want to check for features like geolocation, local storage, and service workers, depending on your app's needs.

How do I handle unsupported features gracefully?

You can provide fallbacks or alternative solutions, like showing a message to users or using polyfills.