Well, actually that's not true, Groovy supports creating fields and properties as well with `var`, so basically everything `def` does except return types.
Gianluca Sartori -- Cell. +39 388 1026822 On Thu, 21 Nov 2024 at 17:41, Daniel Sun <sun...@apache.org> wrote: > Hi Gianluca, > > `var` was introduced to Groovy just for the better compatibility of > Java. Java just supports declaring variables with `var`, so does Groovy. > > Cheers, > Daniel Sun > > On 2024/11/21 10:37:23 Gianluca Sartori wrote: > > Hello everybody, > > > > My name is Gianluca Sartori, from Italy, I am the author of the open > source > > project Dueuno Elements ( > https://github.com/dueuno-projects/dueuno-elements) > > and I am new to this list. > > > > I would like to start using the more Java-ish `var` instead of the > > Python-ish `def` lexicon but I came across the fact that I cannot use > `var` > > as method return type placeholder. > > > > My understanding is that I can use `var` for both local variables and > class > > fields/properties but I cannot use it, for example, if I want to have a > > read only property. The code below does not compile: > > > > class C { > > var firstname > > var lastname > > > > var getFullname() { > > return firstname + ' ' + lastname > > } > > } > > > > var c = new C(firstname: 'Gianluca', lastname: 'Sartori') > > c.fullname > > > > I'd like to switch to using `var` as a type placeholder, but having to > use > > `var` for variable declaration and keep using `def` for methods > definition > > is something I don't understand. I love Groovy because it is easy. This > > restriction of the `var` type placeholder forces me to write code that > > mixes Python lexicon the new Java lexicon. > > > > My main worry is with Grails controllers where we need to define an > action > > using `def` (or `Object`) as return type and define variables in the > method > > body. At the moment we have the following options: > > > > *def* index() { > > *def* myVar = ... > > } > > > > *def* index() { > > *var* myVar = ... > > } > > > > *def* index() { > > *Object* myVar = ... > > } > > > > *Object* index() { > > *def* myVar = ... > > } > > > > *Object* index() { > > *var* myVar = ... > > } > > > > *Object* index() { > > *Object* myVar = ... > > } > > > > I would like to write controllers like this: > > > > *var* index() { > > *var* myVar = ... > > } > > > > to keep the code clean and coherent with the Groovy documentation that > > states clearly that *"If you think of def and var as an alias of Object, > > you will understand in an instant."* > > > > Is this enough of an argument to ask for an implementation of `var` that > is > > fully intrechangable with `def`? > > > > Please let me know what is your opinion on that, > > cheers, > > Gianluca > > > > Gianluca Sartori > > -- > > Cell. +39 388 1026822 > > >
