Since Groovy 1.7.9 we can use the collectEntries method for a Collection to get a Map. We use a closure to transform the elements in the collection to a map entry. And the end result is a Map with all the map entries.
def words = ['Groovy', 'Rocks', 'Big', 'Time']
def result = words.collectEntries {
[(it): it.contains('o')]
}
assert result.Groovy && result.Rocks
assert !result.Big && !result.Time
