From aafdba6be57cd64f9c24c741c6d40c500d022673 Mon Sep 17 00:00:00 2001 From: akr Date: Sat, 5 Nov 2016 02:50:15 +0000 Subject: [DOC] add explanation for Array#sum git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56566 b2dd03c8-39d4-4d8f-98ff-823fe69b080e --- array.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/array.c b/array.c index 55cdd9d7e3..a0cfb214a4 100644 --- a/array.c +++ b/array.c @@ -5717,7 +5717,8 @@ rb_ary_dig(int argc, VALUE *argv, VALUE self) * ["a", "b", "c"].sum("") #=> "abc" * [[1], [[2]], [3]].sum([]) #=> [1, [2], 3] * - * However, Array#join and Array#flatten is faster than Array#sum. + * However, Array#join and Array#flatten is faster than Array#sum for + * array of strings and array of arrays. * * ["a", "b", "c"].join #=> "abc" * [[1], [[2]], [3]].flatten(1) #=> [1, [2], 3] -- cgit v1.2.3