Find this approach useful?
Share it around!
object Bob {
def response(statement: String): String = {
val input = statement.trim()
if (input.isEmpty) return "Fine. Be that way!"
val isShout =
input.exists(_.isLetter) && input.toUpperCase() == input
val isQuestion = input.endsWith("?")
if (isShout)
if (isQuestion) "Calm down, I know what I'm doing!"
else "Whoa, chill out!"
else if (isQuestion) "Sure."
else "Whatever."
}
}
In this approach you have a series of if statements to evaluate the conditions.
As soon as the right condition is found, the correct response is returned.
The String trim() method is applied to the input to eliminate any whitespace at either end of the input.
If the string has no characters left, it returns the response for saying nothing.
Note that a null String would be different from a String of all whitespace.
A null String would throw a NullPointerException if trim() were applied to it.
The first half of setting isShout uses the exists and isLetter methods to look for
at least one English alphabetic character.
This is because the second half of the condition tests that the uppercased input is the same as the input.
If the input were only "123" it would equal itself uppercased, but without letters it would not be a shout.
A question is determined by use of the endsWith method to see if the input ends with a question mark.
At the time of this writing, Scala 3 is not currently supported on the Scala track.
In Scala 3, the if expressions can be written without parentheses, using the if/then/else construct, like so
if isShout then
if isQuestion then "Calm down, I know what I'm doing!"
else "Whoa, chill out!"
else if isQuestion then "Sure."
else "Whatever."
