continue in a for-loop

[chris...@gmail.com]

Hi, 

how can i continue in a for loop? This doesn't compile, continue seems to be no keyword:

for ( it:list(networkInterfaces)){

if (!isPointToPoint())

  continue; //compile error

if (!isUp())

continue;

//now do something useful with it

}

thanks 

Chris

[Jan Köhnlein]

Statements like 'continue', 'break' and 'goto' are not part of Xtend. Neither are labels.
These stand a bit against the functional nature of Xtend.

Your example can be easily transformed.

for (it: list(networkInterfaces)){
if (isPointToPoint() && isUp()) {

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[Zsombor]

More functional would be:

list(networkInterfaces).filter[ isPointToPoint && isUp ].map[ .... ]

BR,

 Zsombor

[chris...@gmail.com]

yea, i figured out the function-style too, now my code looks like this:

    def printAll(Enumeration<NetworkInterface> networkInterfaces, Predicate<NetworkInterface> filter){
        forEnumeration(networkInterfaces).filter(filter).forEach[println(it)]
    }

Now one can use networkInterfaces.printAll[up && pointToPoint] to print all NetworkInterface's using a filter. Xtend did a good job to create a clear and expressive api, once one understand closures/lambdas.

I was surprised that some methods are silently imported. In this case it was filter that was imported from org.eclipse.xtext.xbase.lib.IteratorExtensions, i replaced it by guava's Iterables.filter(Iterable) so i could use it with a guava Predicate. Another surprise was that one have to write .forEach[println(it)] instead of .forEach[println] the variable it will not be applied to println for some reason.

[Sven Efftinge]

On Jun 25, 2013, at 1:16 AM, chris...@gmail.com wrote:

I was surprised that some methods are silently imported. In this case it was filter that was imported from org.eclipse.xtext.xbase.lib.IteratorExtensions, i replaced it by guava's Iterables.filter(Iterable) so i could use it with a guava Predicate. Another surprise was that one have to write .forEach[println(it)] instead of .forEach[println] the variable it will not be applied to println for some reason.

This is because println is not imported as an extension method, so you cannot write it.println() either.

Xtend doesn't support implicit parameters as Scala does.

Sven