Can I use forEach with objects in JavaScript?

Can I use forEach with objects in JavaScript?

No, forEach is a method for arrays. You can use Object.keys() or Object.entries() to iterate over objects.

How do I use Object.keys() to iterate over an object?

You can use Object.keys(obj).forEach(key => { console.log(key, obj[key]); }); to iterate over the keys.

What about using for...in loop?

Yes, you can use a for...in loop to iterate over object properties: for (let key in obj) { console.log(key, obj[key]); }.

Are there any performance differences between these methods?

Yes, for...in can be slower for large objects, while forEach is optimized for arrays. Use the method that fits your needs.