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From "Winnebeck, Jason" <>
Subject RE: Collection/Map Casting
Date Tue, 28 Apr 2015 19:40:49 GMT
Ok, so that is a shorthand for the collect method. But what about to “cast” a Map? I can’t
use *. operator on maps?


From: Shil Sinha []
Sent: Tuesday, April 28, 2015 2:45 PM
Subject: Re: Collection/Map Casting

For your first example, you could do one of the following:

[1,2,3]*.asType(String), which is equivalent to but slower than

Generally, collection*.asType(ClassYouWant) will yield the element type changes you want,
but you will have to cast the resulting ArrayList to the type of collection you want.

On Tue, Apr 28, 2015 at 2:16 PM, Winnebeck, Jason <<>>
Is there an elegant way to cast a collection’s types?

[1,2,3] as List<String> //doesn’t actually work
[1,2,3].collect { it as String } //works but more verbose

[a:1, b:2].collectEntries { k,v -> [k, v as String] } //is there a better way?

The other issue with collectEntries is that the @CompileStatic doesn’t know the type returned,
so you have to actually cast it twice.

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