lib: added 'slice' method to List

[nit.git] / lib / standard / collection / list.nit

diff --git a/lib/standard/collection/list.nit b/lib/standard/collection/list.nit
index 40514fc..3dfac41 100644 (file)
--- a/lib/standard/collection/list.nit
+++ b/lib/standard/collection/list.nit
@@ -76,6 +76,18 @@ class List[E]
                return nb
        end
 
+       # Return a list of elements between 'from' and 'to'.
+       fun slice(from: Int, to: Int): List[E] do
+               assert from >= 0 and from < length
+               assert to >= 0 and to < length and from <= to
+               var list = new List[E]
+               while from <= to do
+                       list.add(self[from])
+                       from += 1
+               end
+               return list
+       end
+
 # Add elements
 
        # O(1)