check null in kotlin code example

Example 1: kotlin is null or empty

// If we do not care about the possibility of getting spaces only...
if (number.isNullOrEmpty()) {
    // alerts the user to fill in their number!
}

// when we need to block the user from inputting spaces only
if (name.isNullOrBlank()) {
    // alerts the user to fill in their name!
}

Example 2: null check in kotlin

if(a != null)  {
//do something
}