obtain dynamically executable path depending on script variable avoiding many ifs - bash

Question

I want to run determined executable depending on a variable of my script cur_num
I have this code, where the paths are "random", meaning they have nothing to do with the secuential cur_num:
run() {
if [ $cur_num = "0" ]
then ~/pathDirName0/execFile0
elif [ $cur_num = "1" ]
then ~/pathDirName1/execFile1
elif [ $cur_num = "2" ]
then ~/pathDirName2/execFile2
elif [ $cur_num = "3" ]
then ~/pathDirName3/execFile3
elif [ $cur_num = "4" ]
then ~/pathDirName4/execFile4
fi
}
In case there are lots more of cases, that resulys in a very long if - elif statement.
As there are no enums in bash to build the cur_num- path relation, is there a cleaner way to obtain the desired path dynamically instead of with lots of ifs?

Answer 1

Try case
case $cur_num in
0) ~/pathDirName0/execFile0;;
1) ~/pathDirName1/execFile1;;
2) ~/pathDirName2/execFile2;;
...
esac

Answer 2

set allows you to create arrays in a portable manner, so you can use that to create an ordered array:
set -- ~/pathDirName0/execFile0 ~/pathDirName1/execFile1 ~/pathDirName2/execFile2 ~/pathDirName3/execFile3 ~/pathDirName4/execFile4
Then to access these items via an index you do $x where x is the index of the item.
Now your code would look something like this:
run() {
original="$#"
: $((cur_num+=1)) # Positional param indexing starts from 1
set -- ~/pathDirName0/execFile0 ~/pathDirName1/execFile1 \
~/pathDirName2/execFile2 ~/pathDirName3/execFile3 \
~/pathDirName4/execFile4
eval "$"$cur_num"" # cur_num = 1, accesses $1 == execFile0
set -- $original # Restore original args
}
A method that is both less and more hacky that would work for indexes above 9 and not mess with the original positional parameters nor use eval
run() {
count=0
for item in "$#"; do
[ "$count" = "$cur_num" ] && {
"$item"
return
}
: "$((count+=1))"
done
echo "No item found at index '$cur_num'"
}
cur_num="$1" # Assuming first arg of script.
run ~/pathDirName0/execFile0 ~/pathDirName1/execFile1 \
~/pathDirName2/execFile2 ~/pathDirName3/execFile3 \
~/pathDirName4/execFile4