KotlinisNullOrBlank

Kotlin's isNullOrBlank() function is a standard library extension function for the String class. It provides a concise way to check if a string is either null or empty after trimming whitespace.

The function returns true if the string is null, or if the string, after removing leading and trailing whitespace characters, has a length of zero. Otherwise, it returns false. This means that a string containing only spaces would be considered blank and return true.

This function is particularly useful for input validation scenarios. For example, when checking if a user has entered any text into a form field, isNullOrBlank() can efficiently determine if the input is valid. It simplifies code that would otherwise require multiple checks, such as string == null || string.isEmpty() || string.isBlank().

The isNullOrBlank() function is part of the standard Kotlin library and does not require any special imports to use, provided you are working with Kotlin projects. Its counterpart, isEmpty(), only checks for a null string or a string with zero length, whereas isBlank() specifically checks for strings that are empty or contain only whitespace. isNullOrBlank() combines both checks efficiently.