Advent of Code 2017

day-1.js

(function() {
	const digits = [...document.body.innerText.trim()].map(Number);

	function captcha(input, interval = 1) {
		return digits.reduce((accu, digit, index) => {
			const nextIndex = (index + interval) % digits.length;
			return digit === digits[nextIndex] ? accu + digit : accu;
		}, 0);
    	}

	const star1 = captcha(digits);
	const star2 = captcha(digits, digits.length / 2);

	console.log(`*1 = ${star1}\n*2 = ${star2}`);
})()

day-2.js

// Star one
(function() {
	const rawRows = document.body.textContent.trim().split('\n');
	const table = rawRows.map(cell => cell.split('\t').map(Number));

	var results = table.map((row) => {
		const max = Math.max(...row);
		const min = Math.min(...row);

		return max - min;
	})

	console.log(results.reduce((a, c) => a + c));
})()

// Star two
(function() {
	const rawRows = document.body.textContent.trim().split('\n');
	const table = rawRows.map(cell => cell.split('\t').map(Number));

	var results = table.map((row) => {
		for (let i = 0; i < row.length; ++i) {
		    for (let j = 0; j < row.length; ++j) {
			if (row[i] % row[j] == 0 && i != j) {
			    return row[i] / row[j];
			}
		    }
		}
	})

	console.log(results);

	console.log(results.reduce((a, c) => a + c));
})()

day-7.js

(function() {
	let programs = document.body.textContent.trim().split('\n').map((programRaw) => {
		const program = /(.+) \((\d*)\) ?-?>? ?(.*)/gi.exec(programRaw);
		return {
			name: program[1], // ID
			weight: program[2],
			childs: program[3] ? program[3].split(', ') : null
		}
	});
	
	// Set parents
	programs = programs.map((program) => {
		const name = program.name;
		var parent = programs.find((program) => {
			return program.childs && program.childs.find((programName) => {
				return name == programName;
			});
		});

		program.parent = parent;

		return program;
	});

	// Find the one with no parents
	const star1 = programs.find((program) => {
		return !program.parent;
	});

	console.log('Star #1:', star1.name)
	console.log('end program', programs)
})();