Arrays Comparison code example

Example 1: how to compare elements in an array

for (let i = 0; i < a.length; i++) {
    for (let k = i + 1; k < a.length; k++) {
        if (a[i] != a[k]) {
            //do stuff
        }
    }
}

Example 2: compare two arrays

echo ${Array1[@]} ${Array2[@]} | tr ' ' '\n' | sort | uniq -u