day 1/index.ts

import { readFileSync } from 'fs'
const input = readFileSync('./input.txt').toString().split('\n');

const firstLast = (str: string) => {
    const newStr = str
        .replaceAll('one', 'o1e')
        .replaceAll('two', 't2o')
        .replaceAll('three', 't3e')
        .replaceAll('four', 'f4r')
        .replaceAll('five', 'f5e')
        .replaceAll('six', 's6x')
        .replaceAll('seven', 's7n')
        .replaceAll('eight', 'e8t')
        .replaceAll('nine', 'n9e')
    const matches = newStr.match(/[\d]/g)
    return matches ? [matches[0], matches[matches.length-1]].join('') : null
}

let int: number = 0;

for(const line of input) {
    int += parseInt(firstLast(line) ?? "0")
}
console.log(int)