Question

It seems like Groovy was forgotten in this thread so I’ll just ask the same question for Groovy.

• Try to limit answers to Groovy core
• One feature per answer
• Give an example and short description of the feature, not just a link to documentation
• Label the feature using bold title as the first line

See also:

1. Hidden features of Python
2. Hidden features of Ruby
3. Hidden features of Perl
4. Hidden features of Java

Answer 1

Using the spread-dot operator

def animals = ['ant', 'buffalo', 'canary', 'dog'] assert animals.size() == 4 assert animals*.size() == [3, 7, 6, 3] 

This is a shortcut for animals.collect { it.size() }.