Advent of Code 2018: [Day 10](https://adventofcode.com/2018/day/10) / Emanuel Feld

Published

Edited

Dec 12, 2018

[Day 10](https://adventofcode.com/2018/day/10)

function getPositions (time) {

return data.map(d => [d[0] + d[2] * time, d[1] + d[3] * time]);

}

function getBounds (positions) {

let [xMax, xMin, yMax, yMin] = [-Infinity, Infinity, -Infinity, Infinity];

for (let row of positions) {

let [x, y] = row;

xMax = Math.max(x, xMax);

xMin = Math.min(x, xMin);

yMax = Math.max(y, yMax);

yMin = Math.min(y, yMin);

}

return [xMax, xMin, yMax, yMin];

}

function getSpread (positions) {

let [xMax, xMin, yMax, yMin] = getBounds(positions);

return (xMax - xMin) + (yMax - yMin);

}

spreadMinimizedAtTime = {

let time = 10000;

let spread = getSpread(getPositions(time));

let lastSpread = spread;

while (spread <= lastSpread) {

time++;

lastSpread = spread;

spread = getSpread(getPositions(time));

}

return time - 1;

}

Experiment and prototype by building visualizations in live JavaScript notebooks. Collaborate with your team and decide which concepts to build out.

Use Observable Framework to build data apps locally. Use data loaders to build in any language or library, including Python, SQL, and R.

Seamlessly deploy to Observable. Test before you ship, use automatic deploy-on-commit, and ensure your projects are always up-to-date.