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runtime(doc): further improve docs about List/Blob += operator

closes: #13990

Signed-off-by: zeertzjq <zeertzjq@outlook.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
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zeertzjq 2024-02-08 11:21:44 +01:00 committed by Christian Brabandt
parent 1efb1b08a1
commit b8170143c8
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2 changed files with 30 additions and 10 deletions

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@ -1,4 +1,4 @@
*eval.txt* For Vim version 9.1. Last change: 2024 Feb 07
*eval.txt* For Vim version 9.1. Last change: 2024 Feb 08
VIM REFERENCE MANUAL by Bram Moolenaar
@ -303,12 +303,15 @@ List concatenation ~
*list-concatenation*
Two lists can be concatenated with the "+" operator: >
:let longlist = mylist + [5, 6]
A list can be concatenated with another one in place using the "+=" operator or |extend()|: >
:let longlist = [5, 6] + mylist
To prepend or append an item, turn it into a list by putting [] around it.
A list can be concatenated with another one in-place using |:let+=| or
|extend()|: >
:let mylist += [7, 8]
:call extend(mylist, [7, 8])
To prepend or append an item, turn the item into a list by putting [] around
it. To change a list in-place, refer to |list-modification| below.
<
See |list-modification| below for more about changing a list in-place.
Sublist ~
@ -427,8 +430,7 @@ To change part of a list you can specify the first and last item to be
modified. The value must at least have the number of items in the range: >
:let list[3:5] = [3, 4, 5]
To add items to a List in-place, you can use the += operator
|list-concatenation|: >
To add items to a List in-place, you can use |:let+=| (|list-concatenation|): >
:let listA = [1, 2]
:let listA += [3, 4]
<
@ -760,12 +762,15 @@ This calls Doit() with 0x11, 0x22 and 0x33.
Blob concatenation ~
*blob-concatenation*
Two blobs can be concatenated with the "+" operator: >
:let longblob = myblob + 0z4455
:let longblob = 0z4455 + myblob
<
A blob can be concatenated with another one in-place using |:let+=|: >
:let myblob += 0z6677
To change a blob in-place see |blob-modification| below.
<
See |blob-modification| below for more about changing a blob in-place.
Part of a blob ~
@ -808,6 +813,18 @@ To change part of a blob you can specify the first and last byte to be
modified. The value must have the same number of bytes in the range: >
:let blob[3:5] = 0z334455
To add items to a Blob in-place, you can use |:let+=| (|blob-concatenation|): >
:let blobA = 0z1122
:let blobA += 0z3344
<
When two variables refer to the same Blob, changing one Blob in-place will
cause the referenced Blob to be changed in-place: >
:let blobA = 0z1122
:let blobB = blobA
:let blobB += 0z3344
:echo blobA
0z11223344
<
You can also use the functions |add()|, |remove()| and |insert()|.
@ -2824,6 +2841,8 @@ declarations and assignments do not use a command. |vim9-declaration|
:let {var} ..= {expr1} Like ":let {var} = {var} .. {expr1}".
These fail if {var} was not set yet and when the type
of {var} and {expr1} don't fit the operator.
`+=` modifies a |List| or a |Blob| in-place instead of
creating a new one.
`.=` is not supported with Vim script version 2 and
later, see |vimscript-version|.

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@ -6124,6 +6124,7 @@ binary-number eval.txt /*binary-number*
bitwise-function usr_41.txt /*bitwise-function*
bitwise-shift eval.txt /*bitwise-shift*
blob eval.txt /*blob*
blob-concatenation eval.txt /*blob-concatenation*
blob-functions usr_41.txt /*blob-functions*
blob-identity eval.txt /*blob-identity*
blob-index eval.txt /*blob-index*