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day02.js
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day02.js
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const { data: directions } = require('./data/day02');
const FORWARD = /forward\s(\d+)/;
const MINUS = /up\s(\d+)/;
const PLUS = /down\s(\d+)/;
const matchDirection = (direction, regex) => {
const matches = direction.match(regex);
if (!matches) {
return null;
}
const [, number] = matches;
return Number(number);
}
const { x, y, aim } = directions.reduce(({ x, y, aim }, direction) => {
const forward = matchDirection(direction, FORWARD);
if (typeof forward === 'number') {
return { x: x + forward, y: y + aim * forward, aim };
}
const plus = matchDirection(direction, PLUS);
if (typeof plus === 'number') {
return { x, y, aim: aim + plus };
}
const minus = matchDirection(direction, MINUS);
if (typeof minus === 'number') {
return { x, y, aim: aim - minus };
}
return { x, y, aim };
}, { x: 0, y: 0, aim: 0 });
console.log({ x, y, 'x*y': x * y, aim });