How to remove Duplicate Values from a list in groovy

Question

I have a collection of ID list to be saved into the database

if(!session.ids) session.ids = []  session.ids.add(params.id)  

and I found out that list has duplicates, like

[1, 2, 4, 9, 7, 10, 8, 6, 6, 5] 

Then I wanted to remove all duplicates by applying something like :

session.ids.removeAll{ //some clousure case } 

I found only this:

http://groovy.codehaus.org/groovy-jdk/java/util/Collection.html

Answer 1

I am not a Groovy person , but I believe you can do something like this :

[1, 2, 4, 9, 7, 10, 8, 6, 6, 5].unique { a, b -> a <=> b } 

Have you tried session.ids.unique() ?