Question

I want to use either a value of expected property or a specified default.
How to achieve this in groovy?

Let’s look at the example:

def printName(object) {
   //if object has initialized property 'name' - print 'name', otherwise print ToString
   if (object<some code here>name && object.name) {
      print object.name
   } else {
      print object
   }
}

Answer 1

You can use hasProperty. Example:

if (object.hasProperty('name') && object.name) {
    println object.name
} else {
    println object
}

If you’re using a variable for the property name, you can use this:

String propName = 'name'
if (object.hasProperty(propName) && object."$propName") {
    ...
}