Groovy Lazy Instance Variables

LazyVariables.groovy

class LazyVariables {
  def lazy(variables) {
    variables.each { name, init ->
      def chars = name.toCharArray()
      chars[0] = Character.toUpperCase(chars[0])
      def getter = "get${new String(chars)}"
      this.metaClass[getter] = {
        def value = init()
        this.metaClass[name] = value
        this.metaClass[getter] = { value }
        value
      }
    }
  }
}

SomeClient.groovy

@Mixin(LazyVariables)
class SomeClient {

  SomeClient() {
    lazy([
      foo: { makeAnExpensiveCall() }
    ]}
  }
}

Is this too crazy/magic?

does it cache if lazy foo is called a second time?

not crazy, I havnt read much scala so i had to go line by line, but got there :)

im just wondering what the equivalent code in javascript looks like!