1 files changed, 14 insertions, 0 deletions

diff --git a/src/ch/epfl/xblast/Lists.java b/src/ch/epfl/xblast/Lists.java
index 073e0cc..da3f919 100644
--- a/src/ch/epfl/xblast/Lists.java
+++ b/src/ch/epfl/xblast/Lists.java
@@ -167,4 +167,18 @@ public final class Lists {
                         .collect(Collectors.toList()));
     }
 
+    /**
+     * Returns an immutable copy of the given list, sorted using the supplied comparator.
+     *
+     * @param l   the list to sort
+     * @param cmp the Comparator to use
+     * @param <T> the type of the list's elements
+     * @return the sorted list
+     */
+    public static <T> List<T> sorted(List<T> l, Comparator<T> cmp) {
+        List<T> r = new ArrayList<>(l);
+        Collections.sort(r, cmp);
+        return Collections.unmodifiableList(r);
+    }
+
 }