The given array is monotonic if it is either monotone increasing or monotone decreasing. An array A is monotone increasing if for all i <= j, A[ i] <= A[j]. An array A is monotone decreasing if for all i <= j, A[i] >= A[j].
About this solution: The candidate's solution is correct and solves the problem. The candidate's approach is also optimal, as they only iterate through the array once.
There are a few ways to validate an email in JavaScript. The most common way is to use a Regular Expression (RegEx) to check the email's syntax.
About this solution: The candidate's solution is complete and solves the problem. The candidate's approach is to use a regular expression to validate the email. The regular expression is a pattern that is used to match the email. The regular expression is tested against the email to see if it matches. If it matches, the email is valid.