Re: currently doable? Indirect notation used w/a hash

[Linda Walsh]

John Kearney wrote:
>  
> Sorry forgot the bit to retrive values
> It is possible to retrive numeric values without eval
> i.e.
> val=$((${ArrayName}[Index]))
> works quiet well and is quick, in fact I used to use this quiet a lot.
>  
>  
> There is also a backdoor approach that I don't really advise.
> val="${ArrayName}[Index]"
> echo "${!val}"
-----
        Don't advise?  Any particular reason?  or stylistic?

Some interesting ways of doing these things -- will have to play
around with them to see howuseful they are in place of some of my
existing hacks -- see if they help them look cleaner ... am always
looking for new ways to clean up my code and make it simpler/easier
to understand even it looks non-standard to language purists...

thanks!

> What I actually tend to do is.
>   ks_array_ChkName() {
>     local LC_COLLATE=C
>     case "${1:?Missing Variable Name}" in
>       [!a-zA-Z_]* | *[!][a-zA-Z_0-9]* ) return 3;;
>     esac
>   }
>   ks_val_Get() {
>     ks_array_ChkName "${1:?Missing Destination Variable Name}" || return $?
>     ks_array_ChkName "${2:?Missing Source Variable Name}" || return $?
>     eval "${1}=\"\${${2}:-}\""
>   }
>   ks_array_GetVal() { ks_val_Get "${1}" "${2}[${3}]" ; }
>   ks_array_SetVal() { ks_val_Set "${1}[${2}]" "${3:-}" ; }
>  
>
> }
> ks_array_SetVal() {
> ks_val_ChkName "${1:?Missing Array Name}" || return $?
> ks_val_ChkName "a${2:?Missing Array Index}" || return $?
> eval "${1}"["${2}"]'="${3:-}"'
> }
> ks_array_SetVal "${ArrayName}" "Index" "Value"