Split collection into sub collections in Groovy

Question

I have an array containing an unknown number of items that I would like to split into separate arrays so that each separate array contains no more than 4 items. What is the

Answer 1

Since Groovy 1.8.6, you can use collate:

def letters = 'a'..'g'
assert letters.collate(3) == [['a', 'b', 'c'], ['d', 'e', 'f'], ['g']]

def letters = 'a'..'g'
assert letters.collate(3) == [['a', 'b', 'c'], ['d', 'e', 'f'], ['g']]

Credit to Mrhaki's Groovy goodness series: http://mrhaki.blogspot.com.au/2012/04/groovy-goodness-collate-list-into-sub.html