String Interpolation in Scala
Strings in scala support a feature called interpolation which provides a way to seamlessly use variables inside a string.
There are three basic interpolators:
sfraw
They function similar to JavaScript tags.
The s Interpolator
It is a very simple interpolator that just places the variables inside the string.
val firstName = "Roger";val middleName = "D.";val lastName = "Gol";val fullName = s"I am $lastName $middleName $firstName!";println(fullName);// I am Gol D. Roger!But what if we need to use methods inside the string?
val firstName = "Roger";val middleName = "d."; // We need to capitalize thisval lastName = "Gol";val fullName = s"I am $lastName $middleName.toUpperCase $firstName!";println(fullName);// I am Gol d..toUpperCase Roger!Definitely not what we wanted. In this case, we can use curly braces to group the entire value.
val fullName = s"I am $lastName ${middleName.toUpperCase} $firstName!";println(fullName);// I am Gol D. Roger!Perfect!
The raw Interpolator
The raw interpolator is almost the same as the s interpolator, except that
it escapes all special characters like \n.
val name = "Kaido";val msg1 = sname";println(msg1) /* Hello, Kaido*/val msg2 = raw"Hello,\n$name";println(msg2) /* Hello,\nKaido*/The f Interpolator
The f interpolator allows the use of format strings (like the ones used in C).
Each variable name should be immediately followed by a format string.
val pi = 3.14;println(f"Pi is $pi%1.0f"); // Pi is 3println(f"Pi is $pi%1.2f"); // Pi is 3.14println(f"Pi is $pi%1.9f"); // Pi is 3.140000000The variables must match the data type. The compiler will otherwise throw an error.
println(f"Pi is $pi%d"); /* error: type mismatch; found : Double required: Int*/