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[xtend] how to pass a function to method to use in filter [message #1415244]

Tue, 02 September 2014 11:55

Marc Schlegel is currently offline

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Messages: 69
Registered: July 2009

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I am having a little problem with the xTend syntax.

I would like to pass a function to a utility-method, which applies this function to the filter of a list.

private def void doStuff(Iterable<MyType> list, (MyType) => Boolean filterFunction)
{
   val result = list.filter[filterFunction] // syntax-error: cannot convert from (MyType) => (MyType) => Boolean to Function1
  .... work on result
}

...
doStuff(intputList)[e | e.isTrue] // compiles nicely

My filterFunction maps MyType to Boolean, so why cant I use it in InterableExtensions.filter?

Thanks

[Updated on: Tue, 02 September 2014 11:56]

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Re: [xtend] how to pass a function to method to use in filter [message #1415251 is a reply to message #1415244]

Tue, 02 September 2014 12:10

Christian Dietrich is currently offline

Christian Dietrich

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Hi,

what about list.filter[filterFunction.apply(it)]

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Re: [xtend] how to pass a function to method to use in filter [message #1415252 is a reply to message #1415251]

Tue, 02 September 2014 12:14

Marc Schlegel is currently offline

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Messages: 69
Registered: July 2009

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Christian Dietrich wrote on Tue, 02 September 2014 12:10

Hi,

what about list.filter[filterFunction.apply(it)]

Yes, that works. Thanks

And as I just figured out, its even easier when using normal bracket Laughing

Laughing

list.filter(filterFunction)

[Updated on: Tue, 02 September 2014 12:14]

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