patch 8.2.1969: Vim9: map() may change the list or dict item type
Problem: Vim9: map() may change the list or dict item type.
Solution: Add mapnew().
diff --git a/runtime/doc/eval.txt b/runtime/doc/eval.txt
index b573a11..c08b75b 100644
--- a/runtime/doc/eval.txt
+++ b/runtime/doc/eval.txt
@@ -2669,8 +2669,9 @@
rhs of mapping {name} in mode {mode}
mapcheck({name} [, {mode} [, {abbr}]])
String check for mappings matching {name}
-mapset({mode}, {abbr}, {dict})
- none restore mapping from |maparg()| result
+mapnew({expr1}, {expr2}) List/Dict like |map()| but creates a new List
+ or Dictionary
+mapset({mode}, {abbr}, {dict}) none restore mapping from |maparg()| result
match({expr}, {pat} [, {start} [, {count}]])
Number position where {pat} matches in {expr}
matchadd({group}, {pattern} [, {priority} [, {id} [, {dict}]]])
@@ -6987,9 +6988,14 @@
< {only available when compiled with the |+lua| feature}
map({expr1}, {expr2}) *map()*
- {expr1} must be a |List| or a |Dictionary|.
+ {expr1} must be a |List|, |Blob| or |Dictionary|.
Replace each item in {expr1} with the result of evaluating
- {expr2}. {expr2} must be a |string| or |Funcref|.
+ {expr2}. For a |Blob| each byte is replaced.
+ If the item type changes you may want to use |mapnew()| to
+ create a new List or Dictionary. This is required when using
+ Vim9 script.
+
+ {expr2} must be a |string| or |Funcref|.
If {expr2} is a |string|, inside {expr2} |v:val| has the value
of the current item. For a |Dictionary| |v:key| has the key
@@ -7024,11 +7030,11 @@
|Dictionary| to remain unmodified make a copy first: >
:let tlist = map(copy(mylist), ' v:val . "\t"')
-< Returns {expr1}, the |List| or |Dictionary| that was filtered.
- When an error is encountered while evaluating {expr2} no
- further items in {expr1} are processed. When {expr2} is a
- Funcref errors inside a function are ignored, unless it was
- defined with the "abort" flag.
+< Returns {expr1}, the |List|, |Blob| or |Dictionary| that was
+ filtered. When an error is encountered while evaluating
+ {expr2} no further items in {expr1} are processed. When
+ {expr2} is a Funcref errors inside a function are ignored,
+ unless it was defined with the "abort" flag.
Can also be used as a |method|: >
mylist->map(expr2)
@@ -7137,7 +7143,13 @@
GetKey()->mapcheck('n')
-mapset({mode}, {abbr}, {dict}) *mapset()*
+mapnew({expr1}, {expr2}) *mapnew()*
+ Like |map()| but instead of replacing items in {expr1} a new
+ List or Dictionary is created and returned. {expr1} remains
+ unchanged.
+
+
+mapset({mode}, {abbr}, {dict}) *mapset()*
Restore a mapping from a dictionary returned by |maparg()|.
{mode} and {abbr} should be the same as for the call to
|maparg()|. *E460*