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kotlinlang

so i'm just getting started converting an existing gradle script into kotlin... and i'll admit i'm a bit confused. generally i've put dependency versions into `gradle.properties` and referenced them in the build.gradle e.g.
```dependencies: {
  compile("foo:bar:${fooBarVersion}");
  ...
}```

it looks like to do the equivalent in kotlin i have to define the variable in the kotlin script first before using it? e.g.

```val fooBarVersion: String by extra
compile("foo:bar:$fooBarVersion")```

is this the case? if so, not sure there is much benefit to externalizing into `gradle.properties` vs just defining the version n the build file... pls let me know if i'm missing something