JavaScript is a programming language used to make websites interactive and dynamic. Features such as buttons that respond to ...

Hello readers, in this blog we will discuss how to check a valid phone number in the form. sometimes you need to add the validation for the phone number which requires a certain format.we have to ...

Use the number. The number become occupied status. If the number has already been occupied, then return false. Time Complexity O(logN) : N is the number of intervals (not numbers) num: Number The ...