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patch 8.2.1969: Vim9: map() may change the list or dict item type

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Problem:    Vim9: map() may change the list or dict item type.
Solution:   Add mapnew().
This commit is contained in:
Bram Moolenaar
2020-11-09 18:31:39 +01:00
parent 8cebd43e97
commit ea696852e7
7 changed files with 205 additions and 53 deletions
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32
runtime/doc/eval.txt
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@@ -2669,8 +2669,9 @@ maparg({name} [, {mode} [, {abbr} [, {dict}]]])
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 @@ luaeval({expr} [, {expr}]) *luaeval()*
< {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 @@ map({expr1}, {expr2}) *map()*
|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 @@ mapcheck({name} [, {mode} [, {abbr}]]) *mapcheck()*
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*

2
runtime/doc/usr_41.txt
View File

@@ -644,6 +644,7 @@ List manipulation: *list-functions*
deepcopy() make a full copy of a List
filter() remove selected items from a List
map() change each List item
mapnew() make a new List with changed items
reduce() reduce a List to a value
sort() sort a List
reverse() reverse the order of a List
@@ -669,6 +670,7 @@ Dictionary manipulation: *dict-functions*
extend() add entries from one Dictionary to another
filter() remove selected entries from a Dictionary
map() change each Dictionary entry
mapnew() make a new Dictionary with changed items
keys() get List of Dictionary keys
values() get List of Dictionary values
items() get List of Dictionary key-value pairs