Advent Of Code 2017 - Day 5

Challenge-1.js

// Day 5 - Challenge #1
// input is an array of integers
function escapeHops(input) {
	let hops = 0;
	for (let pos = 0; pos < input.length;) {
		const prevPos = pos;
		pos += input[pos];
		hops += 1;
		input[prevPos]++;
	}
	return hops;
}

Challenge-2.js

// Day 5 - Challenge #2
// input is an array of integers
function escapeHops2(input) {
	let hops = 0;
	for (let pos = 0; pos < input.length;) {
		const prevPos = pos;
		pos += input[pos];
		hops += 1;
		input[prevPos] += (input[prevPos] >= 3 ? -1 : 1);
	}
	return hops;
}