add clear() method

primitiveCollections/src/main/java/org/lucares/collections/IntList.java

@@ -18,7 +18,6 @@ public final class IntList implements Serializable, Cloneable {
 	// TODO support Iterator
 	// TODO add mod counts
 	// TODO support sublists
-	// TODO use sorted flag in indexOf
 	// TODO add lastIndexOf
 	// TODO remove bounds checks that are handled by java, e.g. negative indices
 	// TODO clear
@@ -518,6 +517,18 @@ public final class IntList implements Serializable, Cloneable {
 		}
 	}
 
+	/**
+	 * Removes all elements from this list.
+	 * <p>
+	 * The implementation is equivalent to calling {@code remove(0, size())} and
+	 * {@code trim()}.
+	 */
+	public void clear() {
+		data = EMPTY_ARRAY;
+		size = 0;
+		sorted = true;
+	}
+
 	/**
 	 * Returns a sequential {@link IntStream} with this collection as its source.
 	 *