Question

Are groovy’s literal lists e.g. ['foo','bar','baz'] backed by an ArrayList (dynamic array), or a LinkedList? There are performance benefits when using one instead of the other in different situations.

Related: is there a way I can find out the type of a variable at runtime in groovy, similar to JavaScript’s typeof operator?

Answer 1

Unless specified it creates it as an ArrayList. You can specify a linked list by def myList = [] as LinkedList or by instantiating directly def myLinkedList = new LinkedList()

myList.getClass().name will tell you the type.