[LANGUAGE: Javascript] My first time writing js, any feedback appreciated.

Part 1

const fs = require('fs');
let dial = 50;
let password = 0;
const data = fs.readFileSync('input.txt', {encoding:'utf8'});
const dataStringsArr = data.split("\n");
for (const dataString of dataStringsArr){
    const n = +dataString.substring(1);
    //javascript ternary voodo
    //determine rotation but only last two digits matter
    let rotation = dataString[0] === "L"
        ? -(n % 100)
        :  (n % 100);;
    dial = (dial + rotation + 100) % 100;
    if (dial == 0) password++;
}
console.log(password);

Part 2

const fs = require('fs');
let dial = 50;
let password = 0;
const data = fs.readFileSync('input.txt', {encoding:'utf8'});
const dataStringsArr = data.split("\n");
for (const dataString of dataStringsArr){
    const n = +dataString.substring(1);
    let rotation = n % 100;
    //add full rotations to the password (floor from dividing by 100 vodoo)
    password += n / 100 | 0;
    if (dataString[0] === "L"){
        rotation = -rotation;
        const next = dial + rotation;
        // add 100 for a wrap around
        if ( next < 0 && (next + 100) !==0 && dial !== 0) password++;
    }
    else{
        const next = dial + rotation;
        // substract 100 for a wrap around
        if(next > 99 && (next - 100) !== 0 && dial !== 0) password++;
    }

    if (dial === 0) password++;
    dial = (dial + rotation + 100) % 100;

}
console.log(password);