How does string interpolation work in Kotlin?

Question

Does the Kotlin compiler translate \"Hello, $name!\" using something like

java.lang.String.format(\"Hello, %s!\", name)

or is

Answer 1

The Kotlin compiler translates this code to:

new StringBuilder().append("Hello, ").append(name).append("!").toString()

There is no caching performed: every time you evaluate an expression containing a string template, the resulting string will be built again.