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Re: [Help-bash] Unsetting members of associative arrays

From: Douglas Lewan
Subject: Re: [Help-bash] Unsetting members of associative arrays
Date: Thu, 11 Apr 2019 19:16:59 -0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Icedove/52.9.1

On 04/11/2019 01:41 PM, Greg Wooledge wrote:
> On Thu, Apr 11, 2019 at 12:32:04PM -0400, Douglas Lewan wrote:
>> The following code doesn't do what I expect. The ostensibly unset array
>> element is still there. There's a work-around: Keep track of the indexes
>> to unset and do that outside the loop.
>> declare -A array
>> for i in address@hidden ; do
>> do
>>     if [[ ${array[${i}]} = bob ]]
>>     then
>>         unset array[${i}]
>>     fi
>> done
> Your quoting is incorrect in two places.
> for i in "address@hidden"; do
>   if [[ ${array[$i]} = bob ]]; then
>     unset 'array[$i]'
>   fi
> done
I agree quoting could be an issue and is certainly a matter of good
style. (My impatience to ask the question led to an incomplete example
and bad style, please forgive me.)

Here's a more complete example.

unset array
declare -A array
for v in 1 2 ; do
    for i in "address@hidden" ; do
    if [[ ${array["${i}"]} = alice ]] ; then
        echo "It's alice."
        if unset array["${i}"] ; then
        echo "success"
        echo "failure"
        echo "It's not alice."
    echo "After ${v},${i}: address@hidden"
    echo "After ${v}: address@hidden"
echo "At end: address@hidden"

On 04/11/2019 01:42 PM, Jesse Hathaway wrote:
> That code works for me on Bash 5.0.3, or am I misunderstanding
> your question?

I'm using bash, version 4.3.48; I should have mentioned that.

Well, as with so many things Linux, once something has been threatened,
it becomes irreproducible. Now every variant I can think of on the above
code acts the way I want.

Thanks for the help.

Douglas Lewan
+1 (908) 720-7908
The trouble with the world is that the stupid are cocksure and the intelligent 
full of doubt. - Bertrand Russell

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