When we click the OK button we see our source code has changed. In our example we have changed it to conf: Finally we can change the name of the parameter. We can let IDEA add the Map type or leave it out.

If our method would have a Map argument already we can re-use it. Here we can choose to create a new Map parameter for named arguments. We select the option Convert parameter to map entry:

Now we activate the Groovy intentions (for me it is Alt+Enter or try Shift+Shift and type Show intentions actions) while we place the cursor on the parameter greeting. Suppose we have the following source code with a simple method definition, 2 arguments, and the invocation of the method: IntelliJ IDEA has a Groovy intention to turn method parameters into a Map parameter for named arguments with a few mouse clicks.

This leads to better readable code and that is very useful. Inside our method or constructor we can then access the Map argument and get the values for the keys. This means all key/value arguments are gathered together and assigned to the Map argument. If the argument is the first in the list of arguments then Groovy allows use to use named arguments when we invoke the method or constructor.

A plain old Java object, Secret defines a get method for key and value. Instead of a list of arguments for a method or constructor we can use a Map argument. Incidents of data breaches which expose sensitive information make headlines. A very useful feature in Groovy is the use of named arguments.

Intellij key to get info about method