how to work with arrays in bash code example

Example 1: bash array

# create an array - just assign first value
arrayname[0]='VALUE'

# define an array
declare -a arrayname=(element1 element2 element3)

# get array element at index 
${arrayname[2]}

# get all array elements
${arrayname[@]}

# get array length
${#arrayname[@]}

Example 2: how to make a list bash

#to create an array:
$ declare -a my_array
#set number of items with spaceBar seperation:
$ my_array = (item1 item2)
#set specific index item:
$ my_array[0] = item1