HackerRank Read in an Array problem solution

In this HackerRank Read in an Array problem solution In this challenge we have given a list of countries, each on a new line, your task is to read them into an array and then display the entire array, with a space between each of the countries' names.

Recommended References

Here's a great tutorial tutorial with useful examples related to arrays in Bash.

Input Format

A list of country names. The only characters present in the country names will be upper or lower case characters and hyphens.

Output Format

Display the entire array of country names, with a space between each of them.

Sample Input

Namibia

Nauru

Nepal

Netherlands

NewZealand

Nicaragua

Niger

Nigeria

NorthKorea

Norway

Sample Output

Namibia Nauru Nepal Netherlands NewZealand Nicaragua Niger Nigeria NorthKorea Norway

Explanation

The entire array has been displayed.

Problem solution.

export i=0
while read x
do
a[i]=$x
#echo $x
i=`expr $i + 1`
done
echo ${a[@]}

Second solution.

while read line
do
    my_array+=( $line )
done

echo ${my_array[@]}

Third solution.

while read country; do
    outline="${outline} ${country}" 
done
echo $outline

Fourth solution.

ar=()
while read s; do
  ar+=($s)
done
echo ${ar[*]}