1 files changed, 28 insertions, 0 deletions
diff --git a/array.c b/array.c
index a3821a52b0..17f5e6119b 100644
--- a/array.c
+++ b/array.c
@@ -1843,6 +1843,33 @@ rb_ary_sort(VALUE ary)
 }
 
 
+static VALUE
+sort_by_i(VALUE i)
+{
+    return rb_yield(i);
+}
+
+/*
+ *  call-seq:
+ *     enum.sort_by! {| obj | block }    -> array
+ *
+ *  Sorts <i>enum</i> in place using a set of keys generated by mapping the
+ *  values in <i>enum</i> through the given block.
+ */
+
+static VALUE
+rb_ary_sort_by_bang(VALUE ary)
+{
+    VALUE sorted;
+
+    RETURN_ENUMERATOR(ary, 0, 0);
+    rb_ary_modify(ary);
+    sorted = rb_block_call(ary, rb_intern("sort_by"), 0, 0, sort_by_i, 0);
+    rb_ary_replace(ary, sorted);
+    return ary;
+}
+
+
 /*
  *  call-seq:
  *     array.collect {|item| block }  -> an_array
@@ -3830,6 +3857,7 @@ Init_Array(void)
     rb_define_method(rb_cArray, "reverse!", rb_ary_reverse_bang, 0);
     rb_define_method(rb_cArray, "sort", rb_ary_sort, 0);
     rb_define_method(rb_cArray, "sort!", rb_ary_sort_bang, 0);
+    rb_define_method(rb_cArray, "sort_by!", rb_ary_sort_by_bang, 0);
     rb_define_method(rb_cArray, "collect", rb_ary_collect, 0);
     rb_define_method(rb_cArray, "collect!", rb_ary_collect_bang, 0);
     rb_define_method(rb_cArray, "map", rb_ary_collect, 0);