Extracting Parameter in Groovy

This section discusses the Extract Parameter refactoring for Groovy. This refactoring lets you perform the following actions:

• Creating a new method parameter from the selected expression within a method. All the usages of the method will be auto-updated.
• Adding a parameter to a closure. If there is a variable, associated with the closure, the calls to this variable are replaced with the corresponding expressions.

In this section:

• Examples
• To extract a parameter in Groovy

Examples

class Cat {
  Cat cat = new Cat()
    def makePestOfItself(){
        print ("miaou!!!!!!!!")
  }
    def makeTroubles(){
        if (makePest){
        makePestOfItself()
    }
  }
}

class Cat {
  Cat cat = new Cat()
  def makePestOfItself(String warning){
    print (warning)
  }
  def makeTroubles(){
    if (makePest){
      makePestOfItself("miaou!!!!!!!!")
    }
  }
}

class Bar {
 def foo = {
    print 'H<caret here>ello, world!'
  }
}

new Bar().foo()
new Bar().foo.call()

class Bar {
  def foo = { String s ->
    print s
  }
}

new Bar().foo('Hello, world!')
new Bar().foo.call('Hello, world!')