[DOC] Mention the edge case of `any?`/`all?`

3 files changed, 17 insertions, 1 deletions

diff --git a/array.c b/array.c
index 72c796728d..a99fd9c73d 100644
--- a/array.c
+++ b/array.c
@@ -7768,6 +7768,9 @@ rb_ary_drop_while(VALUE ary)
  *
  *  Returns +true+ if any element of +self+ meets a given criterion.
  *
+ *  If +self+ has no element, returns +false+ and argument or block
+ *  are not used.
+ *
  *  With no block given and no argument, returns +true+ if +self+ has any truthy element,
  *  +false+ otherwise:
  *
@@ -7829,6 +7832,9 @@ rb_ary_any_p(int argc, VALUE *argv, VALUE ary)
  *
  *  Returns +true+ if all elements of +self+ meet a given criterion.
  *
+ *  If +self+ has no element, returns +true+ and argument or block
+ *  are not used.
+ *
  *  With no block given and no argument, returns +true+ if +self+ contains only truthy elements,
  *  +false+ otherwise:
  *
diff --git a/enum.c b/enum.c
index 490b5e4fc8..6fc2fc9b17 100644
--- a/enum.c
+++ b/enum.c
@@ -1757,6 +1757,9 @@ DEFINE_ENUMFUNCS(all)
  *
  *  Returns whether every element meets a given criterion.
  *
+ *  If +self+ has no element, returns +true+ and argument or block
+ *  are not used.
+ *
  *  With no argument and no block,
  *  returns whether every element is truthy:
  *
@@ -1818,6 +1821,9 @@ DEFINE_ENUMFUNCS(any)
  *
  *  Returns whether any element meets a given criterion.
  *
+ *  If +self+ has no element, returns +false+ and argument or block
+ *  are not used.
+ *
  *  With no argument and no block,
  *  returns whether any element is truthy:
  *
@@ -1848,7 +1854,6 @@ DEFINE_ENUMFUNCS(any)
  *    {foo: 0, bar: 1, baz: 2}.any? {|key, value| value < 1 } # => true
  *    {foo: 0, bar: 1, baz: 2}.any? {|key, value| value < 0 } # => false
  *
- *
  *  Related: #all?, #none?, #one?.
  */
 
diff --git a/hash.c b/hash.c
index bb356725b2..0aab4443df 100644
--- a/hash.c
+++ b/hash.c
@@ -4432,6 +4432,9 @@ any_p_i_pattern(VALUE key, VALUE value, VALUE arg)
  *  Returns +true+ if any element satisfies a given criterion;
  *  +false+ otherwise.
  *
+ *  If +self+ has no element, returns +false+ and argument or block
+ *  are not used.
+ *
  *  With no argument and no block,
  *  returns +true+ if +self+ is non-empty; +false+ if empty.
  *
@@ -4450,6 +4453,8 @@ any_p_i_pattern(VALUE key, VALUE value, VALUE arg)
  *    h = {foo: 0, bar: 1, baz: 2}
  *    h.any? {|key, value| value < 3 } # => true
  *    h.any? {|key, value| value > 3 } # => false
+ *
+ *  Related: Enumerable#any?
  */
 
 static VALUE