Take this simple code:

#!/bin/bash

# Declare an array
my_array=(apple orange banana grape)

# Access an element
echo "First element: ${my_array[0]}"

# Loop through the array
for fruit in "${my_array[@]}"; then
    echo "Fruit: $fruit"
done

# Add an element to the array
my_array+=(kiwi)

# Print the updated array
echo "Updated array: ${my_array[@]}"

How are arrays implemented in bash and in particular how is append implemented? Is it a constant time operation?