I would like to check if a dictionary contains a key, but i dont know how.
I tried this:

```
if [ -z "${codeDict["$STR_ARRAY[2]"]+xxx}" ]
then
    echo "codeDict not contains ${STR_ARRAY[2]}"
    codeDict["${STR_ARRAY[2]}"]="${STR_ARRAY[3]}"
fi

```