* array.c: Improve documentation about

  comparison by hash for concerned methods. [ruby-core:51266]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@38974 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 8 insertions, 3 deletions

diff --git a/array.c b/array.c
index f221a614c9..5d91b38884 100644
--- a/array.c
+++ b/array.c
@@ -3800,7 +3800,7 @@ ary_recycle_hash(VALUE hash)
  *  Returns a new array that is a copy of the original array, removing any
  *  items that also appear in +other_ary+.
  *
- *  It compares elements using their hash (returned by the Object#hash method).
+ *  It compares elements using their #hash and #eql? methods for efficiency.
  *
  *     [ 1, 1, 2, 2, 3, 3, 4, 5 ] - [ 1, 2, 4 ]  #=>  [ 3, 3, 5 ]
  *
@@ -3832,6 +3832,8 @@ rb_ary_diff(VALUE ary1, VALUE ary2)
  *  Set Intersection --- Returns a new array containing elements common to the
  *  two arrays, excluding any duplicates.
  *
+ *  It compares elements using their #hash and #eql? methods for efficiency.
+ *
  *     [ 1, 1, 3, 5 ] & [ 1, 2, 3 ]                 #=> [ 1, 3 ]
  *     [ 'a', 'b', 'b', 'z' ] & [ 'a', 'b', 'c' ]   #=> [ 'a', 'b' ]
  *
@@ -3872,6 +3874,8 @@ rb_ary_and(VALUE ary1, VALUE ary2)
  *  Set Union --- Returns a new array by joining +ary+ with +other_ary+,
  *  excluding any duplicates.
  *
+ *  It compares elements using their #hash and #eql? methods for efficiency.
+ *
  *     [ "a", "b", "c" ] | [ "c", "d", "a" ]    #=> [ "a", "b", "c", "d" ]
  *
  *  See also Array#uniq.
@@ -3921,6 +3925,8 @@ push_value(st_data_t key, st_data_t val, st_data_t ary)
  *  If a block is given, it will use the return value of the block for
  *  comparison.
  *
+ *  It compares values using their #hash and #eql? methods for efficiency.
+ *
  *  Returns +nil+ if no changes are made (that is, no duplicates are found).
  *
  *     a = [ "a", "a", "b", "b", "c" ]
@@ -3983,8 +3989,7 @@ rb_ary_uniq_bang(VALUE ary)
  *
  *  If a block is given, it will use the return value of the block for comparison.
  *
- *  It compares elements using their hash (provided by the Object#hash method)
- *  then compares hashes with Object#eql?.
+ *  It compares values using their #hash and #eql? methods for efficiency.
  *
  *     a = [ "a", "a", "b", "b", "c" ]
  *     a.uniq   # => ["a", "b", "c"]