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import fs from "fs";
const input = fs.readFileSync("./input.txt").toString();
const digits = [
"one",
"two",
"three",
"four",
"five",
"six",
"seven",
"eight",
"nine",
];
const re = new RegExp(`(${digits.join("|")}|\\d)`);
const invertedRe = new RegExp(
`(${digits
.map((digit) => digit.split("").reverse().join(""))
.join("|")}|\\d)`,
);
function parseNumber(s: string) {
return s.length === 1
? Number(s)
: digits.findIndex((digit) => digit === s) + 1;
}
const result = input
.split("\n")
.slice(0, -1)
.map((line) => [
line.match(re)?.[0] || "",
// Reverse the string, find the inverted match right-to-left and reverse again
line
.split("")
.reverse()
.join("")
.match(invertedRe)?.[0]
.split("")
.reverse()
.join("") || "",
])
.reduce((acc, value) => {
if (!value[0].length || !value[1].length) throw new Error("Match failed");
return (
acc + parseNumber(value[0]) * 10 + parseNumber(value[value.length - 1])
);
}, 0);
console.log({ result });
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