lib/standard: add Collection::not_empty

Signed-off-by: Jean Privat <jean@pryen.org>

diff --git a/lib/standard/collection/abstract_collection.nit b/lib/standard/collection/abstract_collection.nit
index d51e710..1b1e71e 100644 (file)
--- a/lib/standard/collection/abstract_collection.nit
+++ b/lib/standard/collection/abstract_collection.nit
@@ -66,6 +66,14 @@ interface Collection[E]
        #     assert [1..1[.is_empty   == true
        fun is_empty: Bool do return length == 0
 
+       # Alias for `not is_empty`.
+       #
+       # Some people prefer to have conditions grammatically easier to read.
+       #
+       #     assert [1,2,3].not_empty  == true
+       #     assert [1..1[.not_empty   == false
+       fun not_empty: Bool do return not self.is_empty
+
        # Number of items in the collection.
        #
        #     assert [10,20,30].length == 3