Compare array of numbers in a batch script - windows

Question

I'm trying to compare a sequence of 9 numbers (separated by ,) using a batch file.
The comparison is always made by the corresponding sequence like:
mPrevious[0] <-> mCurrent[0]
mPrevious[1] <-> mCurrent[1]
I need to know if at least one sequece have changed. In the example bellow, 234 changed to 230 and 146 to 149.
The sketch I have so far is:
setlocal ENABLEDELAYEDEXPANSION
#echo off
set mPrevious=229,234,235,127,58,0,131,133,146
set mCurrent=229,230,235,127,58,0,131,133,149
for /f "tokens=1,2,3,4,5,6,7,8,9 delims=," %%a IN ('echo !mPrevious!') do (
)
The number of entries (currently 9) might change in the future. But for now they are just 9.
I'm not sure what is the proper way to do it inside a batch script.

Answer 1

#echo off
title <nul && title ...\%~nx0
setlocal enabledelayedexpansion
set "_mPrevious=229,234,235,127,58,0,131,133,146"
set "_mCurrents=229,230,235,127,58,0,131,133,149"
echo/!_mPrevious!|find "!_mCurrents!" >nul && (
endlocal & echo\Nothing changed^!! & goto :EOF )
for %%i in (!_mPrevious!)do set /a "_i+=1+0" && call set "_mPrev_!_i!=%%~i"
for %%j in (!_mCurrents!)do set /a "_j+=1+0" && call set "_mCurr_!_j!=%%~j"
if !_i! neq !_j! endlocal & echo\Varyables have different lengths^!! & goto :EOF
for /L %%L in (1 1 !_j!)do if !_mPrev_%%~L! neq !_mCurr_%%~L! echo\!_mPrev_%%~L! updated to: !_mCurr_%%~L!
endlocal && goto :EOF
Outputs:
234 updated to: 230
146 updated to: 149
One simple way to do this only if necessary and only if both variable has same length:
Make a first comparison if the variables are the same, there was a change in the values:
echo/!_mPrevious!|find "!_mCurrents!" >nul && (
endlocal & echo\Nothing changed^!! & goto :EOF )
And a second if they continue with the same length:
if !_i! neq !_j! endlocal & echo\Variables have different lengths^!! & goto :EOF
Obs.: 1. I prefer replace [ ] to one simple _
Obs.: 2. Also, change i+= to _i+=1+0, where no need predefined set command: set i=0

Answer 2

The FOR token delimiters are: <SPACE> <TAB> <NBSP> , ; =
Therefore, you can put it into a FOR loop, but it would fail if the content contained * or ?.
#echo off
====SETLOCAL EnableDelayedExpansion EnableExtensions
set/a"#=cnt=0"
::Define lists
set "mPrevious=229,234,235,127,58,0,131,133,146"
set "mCurrent=229,230,235,127,58,0,131,133,149"
FOR %%P in (!mPrevious!) do (
FOR %%C in (!mCurrent!) do (
if !cnt! equ !#! echo(%%P %%C
set/a"cnt+=1"
)
set/a"cnt=0,#+=1"
)

Answer 3

This is an approach using some self-expanding code:
#echo off
setlocal EnableDelayedExpansion
rem // Define constants here:
set "mPrevious=229,234,235,127,58,0,131,133,146"
set "mCurrents=229,230,235,127,58,0,131,133,149"
rem // Initialise auxiliary variables and indexes:
set "nPrevious=,%mPrevious%" & set /A "i=0"
set "nCurrents=,%mCurrents%" & set /A "j=0"
rem // Convert lists to arrays using self-expanding code:
set "_=%nPrevious:,=" & set /A "i+=1" & set "nPrevious[!i!]=%"
set "_=%nCurrents:,=" & set /A "j+=1" & set "nCurrents[!j!]=%"
rem // Verify availability of arrays:
> nul 2>&1 set nPrevious[ || set /A "i=0"
> nul 2>&1 set nCurrents[ || set /A "j=0"
rem // Determine minimal and maximal count:
if %j% gtr %i% (set /A "k=i, l=j" & set "_=#") else (set /A "k=j, l=i" & set "_=")
rem // Compare corresponding elements:
for /L %%K in (1,1,%k%) do if !nPrevious[%%K]! neq !nCurrents[%%K]! (
echo [%%K]: !nPrevious[%%K]! -^> !nCurrents[%%K]!
)
rem // Return removed or added elements:
set /A "k+=1" & for /L %%K in (!k!,1,%l%) do if defined _ (
echo [%%K]: --- -^> !nCurrents[%%K]!
) else (
echo [%%K]: !nPrevious[%%K]! -^> ---
)
endlocal
Sample output, relying on the data of the question:
[2]: 234 -> 230
[9]: 146 -> 149