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I'm trying to find a concise way to format a String with an Option[String] in Scala. I have a title String and a subtitle Option[String]. Here's what I have but I feel like there has to be a better way:
"Title%s".format(subtitle match
{case Some(s) => ": %s".format(s)
case None => "" })
So if I have a subtitle, I want "Title: Subtitle", but if subtitle is None, I just want "Title".
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In Scala Formatting of strings can be done utilizing two methods namely format() method and formatted() method. These methods have been approached from the Trait named StringLike.
The Option in Scala is referred to a carrier of single or no element for a stated type. When a method returns a value which can even be null then Option is utilized i.e, the method defined returns an instance of an Option, in place of returning a single object or a null.
In Scala, as in Java, a string is an immutable object, that is, an object that cannot be modified. On the other hand, objects that can be modified, like arrays, are called mutable objects. Strings are very useful objects, in the rest of this section, we present important methods of java. lang.
An Option[T] can be either Some[T] or None object, which represents a missing value. For instance, the get method of Scala's Map produces Some(value) if a value corresponding to a given key has been found, or None if the given key is not defined in the Map.
subtitle map (t => s"Title: $t") getOrElse ("Title")
String interpolation is more safe than format because if you don't use correct variable name, or missuse it somehow it will fail at compile time. format will fail at run time if the number of placeholders or their types do not match format arguments.
Your version of Scala must support this feature and have it enabled.
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