How to compare the current array element with the next one?

Question

JavaScript

Hello everyone, how to compare the current element of an array with the next one? now the problem is that the last subsequent e-mail. - undefined .
Here is the code

for(let i = 0;i<arr.length;i++){
        console.log(arr[i],arr[i + 1])
    }

Answer 1

Before comparing, check that the next element!== undefined