How do I find the length of an array in JavaScript?

How do I find the length of an array in JavaScript?

You can find the length of an array in JavaScript using the .length property. For example, let arr = [1, 2, 3]; console.log(arr.length); will output 3.

Can I use it on an empty array?

Yes, if you use .length on an empty array, it will return 0. For example, let emptyArr = []; console.log(emptyArr.length); will output 0.

What happens if I add elements to the array?

If you add elements to the array, the length will automatically update. For instance, if you do arr.push(4);, then arr.length will return 4.

Is the length property read-only?

The .length property is read-only in the sense that you cannot directly set it to a value that doesn't correspond to the actual number of elements in the array. However, you can change the length of an array by adding or removing elements.