#!/bin/bash
#
# associative_array.bash. Derived from:
# https://stackoverflow.com/questions/3112687/how-to-iterate-over-associative-arrays-in-bash

# Make an array and stuff it full of values
declare -A array
array[repo_one]=true
array[repo_two]=true
array[repo_three]=false

# The key is accessed using the exclamation point
for i in "${!array[@]}"
do
  echo "key: $i"
  if ${array[$i]}; then
    echo "$i is true"
  fi
done

# Output will be:
#
# key: repo_one
# repo_one is true
# key: repo_two
# repo_one is true
# key: repo_three

# NOTE: Be care of -A versus -a in the array declaration. A -a makes an *indexed* array as opposed to an *associative* array.
#       But given that an associative array is actually a hash table, it doesn't store the pairs in the order you put them
#       into the array, they are instead stored in their hash value order. If order matters you need to use an indexed array.
# The following shows how to use both an indexed array and an associative array together to get both, if that's what you need.
# (Ref https://stackoverflow.com/questions/29161323/how-to-keep-associative-array-order)
declare -a arrOrder       ; declare -A arrData
arrOrder+=( repo_one )    ; arrData[repo_one]=true
arrOrder+=( repo_two )    ; arrData[repo_two]=true
arrOrder+=( repo_three )  ; arrData[repo_three]=false
for i in "${arrOrder[@]}"
do
    echo "$i: ${arrData[$i]}"
done