How to check if element exists using a lambda expression

Question

Specifically  I have TabPane  and I would like to know if there is element with specific ID in it   So  I would like to do this with lambda expression in Java   boolean idExists   false  String idToCheck    someId    for  Tab t   tabPane getTabs         if t getId   equals idToCheck             idExists   true

User · Accepted Answer

Try to use anyMatch of Lambda Expression  It is much better approach    boolean idExists   tabPane getTabs   stream                anyMatch t - gt  t getId   equals idToCheck

User · Answer

While the accepted answer is correct  I ll add a more elegant version  in my opinion    boolean idExists   tabPane getTabs   stream        map Tab  getId       anyMatch idToCheck  equals     Don t neglect using Stream map   which allows to flatten the data structure before applying the Predicate

User · Answer

The above answers require you to malloc a new stream object   public  lt T gt  boolean containsByLambda Collection lt   extends T gt  c  Predicate lt   super T gt  p         for  final T z   c            if  p test z                 return true                      return false     public boolean containsTabById TabPane tabPane  String id        return containsByLambda tabPane getTabs    z - gt  z getId   equals id          if  containsTabById tabPane  idToCheck

[java] How to check if element exists using a lambda expression?

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