HackerRank - Concatenate an array with itself

Problem:

Given a list of countries, each on a new line, your task is to read them into an array. Then, concatenate the array with itself (twice) - so that you have a total of three repetitions of the original array - and then display the entire concatenated array, with a space between each of the countries' names.

# Input

• Namibia
• Nauru
• Nepal
• Netherlands
• NewZealand
• Nicaragua
• Niger
• Nigeria
• NorthKorea
• Norway

# Output

• Namibia Nauru Nepal Netherlands NewZealand Nicaragua Niger Nigeria NorthKorea Norway Namibia Nauru Nepal Netherlands NewZealand Nicaragua Niger Nigeria NorthKorea Norway Namibia Nauru Nepal Netherlands NewZealand Nicaragua Niger Nigeria NorthKorea Norway

# Solution

            
    mapfile -t array
    array=(${array[@]} ${array[@]} ${array[@]})
    echo ${array[@]}
    

Post:

• 2025-04 - Display an element of an array;