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How to check if a string is empty in Kotlin?
In this article, we will see three different ways to check whether a String is empty in Kotlin.
Example – isEmpty()
Kotlin library function isEmpty() can be used in order to check whether a String is empty. Note that it counts spaces too.
fun main(args: Array<String>) {
// No space between the quotes
val myString = ""
// Space between the quotes
val anotherString = " "
println(myString.isEmpty())
// this will return false as we have a space
println(anotherString.isEmpty())
}Output
On execution, it will produce the following output −
true false
Observe that the second string is not empty because it contains a space.
Example – isBlank()
isBlank() can be used to check whether a String value is blank or not. We will be getting True for both the scenario used above, as the value actually contains a blank value.
fun main(args: Array<String>) {
// Without Space
val myString = ""
// With Space
val anotherString = " "
// Both the strings are blank
println(myString.isBlank())
println(anotherString.isBlank())
}Output
On execution, it will produce the following output −
true true
Example – isNullOrBlank() or isNullOrEmpty()
isNullOrBlank() and isNullOrEmpty() are the other two functions that can be used to check whether a given string is empty or not.
fun main(args: Array<String>) {
// string without space
val myString = ""
// string with a space
val anotherString = " "
//true :: null and blank
println(myString.isNullOrBlank()?.toString())
//true ::null and empty
println(myString.isNullOrEmpty()?.toString())
//true :: null and blank
println(anotherString.isNullOrBlank()?.toString())
//false :: null but not empty; contains whiteSpace
println(anotherString.isNullOrEmpty()?.toString())
}Output
It will generate the following output −
true true true false
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