Reference other return value with the following syntax:
```
returnA:
return callA() if _ > 5
return callB() if _ > 10 && returnA._ > 1
```
Cheers,
Daniel Sun
On 2020/07/25 19:57:16, Daniel Sun <sun...@apache.org> wrote:
> Or a more verbose version:
>
> ```
> return callB() if (r -> r > 10)
> ```
>
> Cheers,
> Daniel Sun
> On 2020/07/25 19:51:47, Daniel Sun <sun...@apache.org> wrote:
> > If we take intellisense of IDE into account, the proposal could be refined
> > as follows:
> >
> > ```
> > return callB() [r -> r > 10]
> > ```
> >
> > Cheers,
> > Daniel Sun
> > On 2020/07/25 19:39:20, Daniel Sun <sun...@apache.org> wrote:
> > > Hi OC,
> > >
> > > Let me make the example a bit more complicated to clarify my proposal:
> > >
> > > ```
> > > def m() {
> > > def a = callA()
> > > if (null != a) return a
> > >
> > > def b = callB()
> > > if (b > 10) return b
> > >
> > > def c = callC()
> > > if (null != c && c < 10) return c
> > >
> > > LOGGER.debug('the default value will be returned')
> > >
> > > return defaultValue
> > > }
> > > ```
> > > The above code could be simplified as follows:
> > > ```
> > > def m() {
> > > return? callA() // same to `return(r -> null != r)
> > > callA()`
> > > return(r -> r > 10) callB()
> > > return(r -> null != r && r < 10) callC()
> > >
> > > LOGGER.debug('the default value will be returned')
> > >
> > > return defaultValue
> > > }
> > > ```
> > >
> > > Cheers,
> > > Daniel Sun
> > > On 2020/07/25 19:21:01, OCsite <o...@ocs.cz> wrote:
> > > > Daniel,
> > > >
> > > > -1. In my personal experience this happens very rarely, not worth a
> > > > special support in the language by far. Almost all similar cases for me
> > > > are covered by simple
> > > >
> > > > def foo() {
> > > > ... ...
> > > > bar()?:defaultValue
> > > > }
> > > >
> > > > and the cases where this is not adequate, either due a non-null false
> > > > return value which should be returned instead of the default, or due to
> > > > a non-trivial code needed at //! below, in my code almost never happen.
> > > >
> > > > Contrariwise, if you are about to improve the language for simplicity
> > > > and easiness of returns, you definitely should consider allowing
> > > > returning void from a void method — this should be a completely valid
> > > > code (as is e.g., in C):
> > > >
> > > > void foo() { ... }
> > > > void bar() {
> > > > return foo()
> > > > }
> > > >
> > > > As always, of course, YMMV.
> > > >
> > > > All the best,
> > > > OC
> > > >
> > > > > On 25 Jul 2020, at 20:55, Daniel Sun <sun...@apache.org> wrote:
> > > > >
> > > > > Hi all,
> > > > >
> > > > > We always have to check the returning value, if it match some
> > > > > condition, return it. How about simplifying it? Let's see an example:
> > > > >
> > > > > ```
> > > > > def m() {
> > > > > def r = callSomeMethod()
> > > > > if (null != r) return r
> > > > > //!
> > > > > return theDefaultResult
> > > > > }
> > > > > ```
> > > > >
> > > > > How about simplifying the above code as follows:
> > > > > ```
> > > > > def m() {
> > > > > return? callSomeMethod()
> > > > //!
> > > > > return theDefaultResult
> > > > > }
> > > > > ```
> > > > >
> > > > > Futhermore, we could make the conditional return more general:
> > > > > ```
> > > > > def m() {
> > > > > return(r -> r != null) callSomeMethod() // we could do more
> > > > > checking, e.g. r > 10
> > > > > return theDefaultResult
> > > > > }
> > > > > ```
> > > > >
> > > > > Any thoughts?
> > > > >
> > > > > Cheers,
> > > > > Daniel Sun
> > > >
> > > >
> > >
> >
>
