Function printing arrays

[hancooper]

‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On Thursday, August 26, 2021 2:02 AM, Dennis Williamson 
<dennistwilliamson@gmail.com> wrote:

> On Wed, Aug 25, 2021, 7:45 PM hancooper via help-bash@gnu.org wrote:
>
> > I have the following function that prints associative arrays.with key and
> > value.
> > Would like to extend it to print normal arrays (non-associative - without
> > keys) as well.
> > I call it using pfa "TITLE" assoc_array
> > pfa ()
> > {
> > local _title="$1"
> > local -n asta="$2"
> > local ky="" i=0
> > local sga=$(tput setaf 118)
> > local sgr=$(tput sgr0)
> > echo -n $sga ; printf '\n%s\n' "$_title" ; echo -n $sgr
> > printf '%s\n' "nelm: ${#asta[@]} \${#asta[@]}"
> > printf '%s%s%s\n' $sga "---" $sgr
> > i=0
> > for ky in "${!asta[@]}"; do
> > ((i+=1))
> > printf 'Key: %s\n' "$ky"
> > printf 'Val: %s\n' "${asta[$ky]}"
> > if (( i == ${#asc[@]} )); then
> > printf '%s%b%s\n\n' "$sga" '-\u2625-' "$sgr"
> > else
> > printf '%s%s%s\n' "$sga" '---' "$sgr"
> > fi
> > done
> > }
>
> I haven't tried your function or really read it very closely, but have you
> tried it on indexed arrays?
>
> A couple of things to keep in mind:
>
> Indexed arrays have keys, too. They just happen to be limited to positive
> integers
>
> Indexed arrays are sparse. So it's better to iterate over the existing
> indices (${!arr[@]}) or elements (${arr[@]}) and not use an incremented
> index (for ((index=1;index<=${#arr[@]});index++)); do) because that may
> access elements that don't exist and return values that appear to be null.
>
> So your function may work as is.

I am not using an incremented index

(for ((index=1;index<=${#arr[@]});index++)); do)

When I use a sparse indexed array

 a=([0]=x [3]=x [5]=x [8]=x [13]=x)
 linge-pfa "TITLE" a

the printing is correct

TITLE
nelm: 5 ${#asta[@]}
---
Key: 0
Val: x
---
Key: 3
Val: x
---
Key: 5
Val: x
---
Key: 8
Val: x
---
Key: 13
Val: x
---