Improve performance of Array#- when it is called with empty array

This change make Array#- return a copy of the receiver when the other array is empty.
NjemStar · Feb 6, 2021 · e1e61e2 · e1e61e2
1 parent 94fb62e
commit e1e61e2
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/array.c b/array.c
@@ -5291,6 +5291,7 @@ rb_ary_diff(VALUE ary1, VALUE ary2)
     long i;
 
     ary2 = to_ary(ary2);
+    if (RARRAY_LEN(ary2) == 0) { return ary_make_shared_copy(ary1); }
     ary3 = rb_ary_new();
 
     if (RARRAY_LEN(ary1) <= SMALL_ARRAY_LEN || RARRAY_LEN(ary2) <= SMALL_ARRAY_LEN) {