Groovy Goodness: Removing Duplicate Elements in a CollectionMessages from mrhaki

Groovy Goodness: Removing Duplicate Elements in a Collection - Messages from mrhaki

Groovy Goodness: Removing Duplicate Elements in a Collection

We can easily remove duplicate elements in a collection with the different unique() methods. Without any parameters the default comparator for the objects is used to determine duplicate elements. But we can also use a closure to define the rules for duplicate elements. The closure can have one parameter and then we must return a value that is used for comparison, or the closure has two parameters and then we must return an Integer value where 0 means the items are not unique. Finally we can pass our own Comparator implementation to the unique() method where we define when an element is unique or not.

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