06.ts

import { getFileContent } from "./utils.js";

const isDifferent = (str: string, startIndex: number, count: number = 4) => {
  const arr = str.split("").slice(startIndex, startIndex + count);
  if (arr.length === new Set(arr).size) return true;
  return false;
};

const first = (str: string) => {
    for (let i = 0; i < str.length - 4; i++) {
        if (isDifferent(str, i)) {
            const result = i + 4;
            console.log(result);
            return result;
        }
    }
    return -1;
};

const second = (str: string) => {
    for (let i = 0; i < str.length - 14; i++) {
        if (isDifferent(str, i, 14)) {
            const result = i + 14;
            console.log(result);
            return result;
        }
    }
    return -1;
};

const data = getFileContent("input.txt");
console.assert(first(data) === 1582, "Not matching first part");
console.assert(second(data) === 3588, "Not matching second part");