man bash
https://stackoverflow.com/questions/8880603/loop-through-an-array-of-strings-in-bash

--- begin
## declare an array variable, declare can be omitted
declare -a arr=("element1" "element2" "element3")

## now loop through the above array
for i in "${arr[@]}"
do
   echo "$i"
   # or do whatever with individual element of the array
done
--- end

You can access them using echo "${arr[0]}", "${arr[1]}" also

also works for multi-line array declaration:

declare -a arr=("element1" 
                "element2" "element3"
                "element4"
                )


with a counter:
===============
#!/bin/bash
## declare an array variable
declare -a array=("one" "two" "three")

# get length of an array
arraylength=${#array[@]}

# use for loop to read all values and indexes
for (( i=1; i<${arraylength}+1; i++ ));
do
  echo $i " / " ${arraylength} " : " ${array[$i-1]}
done
Output:

1  /  3  :  one
2  /  3  :  two
3  /  3  :  three