Question

Could anyone please explain how can I check if String is null or empty?

I have a below code which is giving different result explain why.

val someMap = ListMap[String,String]("key1" -> "")
val s = ""
println("s.isEmpty() : "+s.isEmpty())
println("someMap.get(\"key1\") : "+someMap.get("key1").toString().isEmpty)

Result is

s.isEmpty() : true
someMap.get("key1") : false

But why?

Answer 1

This is because Map.get returns an Option: either Some(value) if the value is in the Map or None, if there is no such key in Map.

If you turn Some("") to a string you’ll get "Some()" which is definitely not empty.

To achieve the behavior you wanted, write your code as

someMap("key1").toString.isEmpty