[SOLVED] Bash array transformation like .map() in JavaScript

Issue

In JavaScript, the Array.map() function exists such that

const array1 = [1, 4, 9, 16];
const map1 = array1.map(x => x * 2);
console.log(map1);
// expected output: Array [2, 8, 18, 32]

I need a bash equivalent where I can take my array, manipulate its contents, then receive a new array with the manipulations.

array1=(1 4 9 16)
map1=# ????
echo ${map1[*]}

Solution

Soooooooo, just write the loop.

array1=(1 4 9 16)
map1=()
for i in "${array1[@]}"; do
   map1+=("$((i * 2))")
done
echo "${map1[@]}"

Might be a good time to re-read an introduction to Bash arrays.

Answered By - KamilCuk

Answer Checked By - Cary Denson (WPSolving Admin)