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function dec(strIn, token) {
let shift = token.substr(0, 1).charCodeAt(0);
const A = token.substr(1).split("");
let outStr = [];
let arr = strIn.split("");
for (let i in arr) {
let value = arr[i];
outStr.push(A[value.charCodeAt(0) - shift]);
}
return outStr.join("");
}
const token = 'C7AHISDN2WGQMZFCPL9TRV3OJ6KBEUX851Y4';
const strIn = ']OcfRN'; // input, 6 chars
console.log(dec(strIn, token)); // output, 5 chars
JavaScript
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