Programming Groovy 2

4.8 Dynamic Closures

We can determine whether a closure has been provided to us. Otherwise, we may decide to use a default implementation for, say, an algorithm in place of a specialized implementation the caller failed to provide. Here’s an example to figure out whether a closure is present:

def doSomeThing(closure) {
  if (closure) {
    closure()
  } else {
    println "Using default implementation"
  }
}

doSomeThing() { println "Use specialized implementation" }

doSomeThing()

The code determines if a closure is provided and responds accordingly:

Use specialized implementation
Using default implementation

We also have quite a bit of flexibility in passing parameters. We can dynamically ...