How do I concatenate two arrays in JavaScript?

How do I concatenate two arrays in JavaScript?

You can concatenate two arrays using the concat() method or the spread operator. For example: array1.concat(array2) or [...array1, ...array2].

What if I want to concatenate more than two arrays?

You can still use the concat() method by passing multiple arrays: array1.concat(array2, array3) or use the spread operator: [...array1, ...array2, ...array3].

Are there any performance differences between these methods?

Yes, the spread operator can be more performant for large arrays, but it depends on the context. Generally, both methods are efficient.

Can I concatenate arrays of different types?

Yes, you can concatenate arrays containing different data types, such as numbers, strings, and objects.