Dynamic filtering conditions in Lambda

[Brian Goetz]

How about:

   name.stream()
       .filter(n -> startsWith.stream().anyMatch(s -> n.startsWith(s)))
       ...

On 10/11/2013 6:25 PM, Daniel Sachse wrote:
> Hey guys,
>
> I having the following working Java 8 code:
>
> List<String> names = Arrays.asList("Ben", "Brad", "Bill", "Kim", "Kara",
> "Sam", "Sara", "Jil", "Brenda");
>
> List<String> result = names.stream().filter(name -> name.startsWith("K"))
>
>                  .filter(name -> name.length() == 3)
>                  .collect(toList());
>
> ============
>
> Now I change it to use multiple possible first letters and lenghts:
>
> List<String> result = names.stream().filter(name -> name.startsWith("K") ||
> name.startsWith("B"))
>
>                  .filter(name -> name.length() == 3 || name.length() == 4)
>                  .collect(toList());
>
>
> ============
>
> Now I want to rewrite this and use a dynamic list of starting letters and a
> dynamic list of length attributes, but I totally got stuck on how to
> implement this :
>
> List<String> names = Arrays.asList("Ben", "Brad", "Bill", "Kim", "Kara",
> "Sam", "Sara", "Jil", "Brenda");
>
> *List<String> *startsWith* = Arrays.asList("B", "K", "S");*
> *List<Integer> *length* = Arrays.asList(2, 3, 4);*
>
> List<String> result = names.stream().
> // Filters missing
>
>                  .collect(toList());
>
>
> ============
>
> I would be really glad if you could provide me with a solution how this
> could be implemented using Lambdas :)
>
>
> Thanks in advance!
>
> Daniel
>
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>
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