Groovy Goodness: Transform Elements While Flattening [Snippet]
Learn more about elements in this Groovy snippet.
By
·
·
Code Snippet
Likes
(3)
Likes
There are no likes...yet! 👀
Be the first to like this post!
It looks like you're not logged in.
Sign in to see who liked this post!
Comment
Save
8.2K Views
Join the DZone community and get the full member experience.
Join For Free 
flatten method in Groovy to flatten a collection that contains other collections into a single collection with all elements. We can pass a closure as an extra argument to the
flatten method to transform each element that is flattened. The argument of the closure is the element from the original collection.
You may also like: [DZone Refcard] Getting Started With Groovy
In the following example, we first use the flatten method without a closure argument. Then we pass a closure argument and transform the element:
Groovy
x
1
def list = [1, [2, 3], [[4]]]
2
3
// Simple flatten the nested collections.
4
assert list.flatten() == [1, 2, 3, 4]
5
6
// We can use a closure to transform
7
// the elements in the resulting collection.
8
assert list.flatten { it * 2 } == [2, 4, 6, 8]
Groovy (programming language)
Element
Snippet (programming)
Published at DZone with permission of Hubert Klein Ikkink. See the original article here.
Opinions expressed by DZone contributors are their own.
Comments