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:
| UsingClosures/MissingClosure.groovy | |
| | 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 determine ...
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