Reverse an Array in Windows Batch
The below code shows how to reverse the order of elements in a windows batch file's array:
@echo off
cls
echo Script Started
verify badvalue 2> nul
setlocal enableextensions enabledelayedexpansion
if errorlevel 1 call:hardError "Unable to enable command extensions."
set arrayTest=("1", "2", "3", "test")
echo.Forward: %arrayTest%
for %%1 in %arrayTest% do (call:outputElement %%1)
call:reverseArray %arrayTest%
echo.Backward: %reverseArray%
for %%1 in %reverseArray% do (call:outputElement %%1)
goto:end
:reverseArray
set reverseArray=
for %%1 in %* do (call:reverseArrayX %%1)
set reverseArray=(%reverseArray%)
@goto:eof
:reverseArrayX
if "%reverseArray%"=="" (set reverseArray=%1) else (set reverseArray=%1, %reverseArray%)
@goto:eof
:outputElement
echo. - %~1
@goto:eof
:hardError
echo.ERROR: %* &::display all exception information (allows multiple parameters to be passed / displays them all to ensure flexibility)
pause &::whilst testing keep this enabled ::todo: remove after testing
exit &::ensure we don't go forwards after a hard error - nb this will terminate the current console window
:end
Echo.Completed
exit /b &::should happen anyway but this makes it explicit
Written by John Bevan
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