Notebooks 2.0 is here.

Read the preview announcement
The avatar for @georgeh
George Hotelling
Published
Advent of Code 2020
Edited
Dec 3, 2020
Advent of Code 2020
Advent of Code 2020 Day 19Advent of Code 2020 Day 18Advent of Code 2020 Day 17Advent of Code 2020 Day 16Advent of Code 2020 Day 14Advent of Code 2020 Day 15Advent of Code Day 13Advent of Code 2002 Day 12Advent of Code 2020 Day 11Advent of Code 2020 Day 10Advent of Code 2020 Day 8Advent of Code 2020 Day 9Advent of Code 2020 Day 7Advent of Code 2020 Day 6Advent of Code 2020 Day 5Advent of Code 2020 Day 4
Advent Of Code 2020 Day 3
Advent of Code 2020 Day 2Advent of Code 2020 Day 1
Insert cell
Insert cell
Insert cell
parseInput = i => i.split('\n').map(l => l.split(''))
Insert cell
testMap = parseInput(testInput)
Insert cell
getCell = (map, x, y) => {
const mapX = x % map[y].length;
return map[y][mapX];
}
Insert cell
getCell(testMap, 0, 0)
Insert cell
getCell(testMap, 3, 1)
Insert cell
getCell(testMap, 6, 2)
Insert cell
countTrees = (map, right, down) => {
let x = 0, y = 0, count = 0;
while (y < map.length) {
if ( getCell(map, x, y) === '#' ) count++;
x += right;
y += down;
}
return count;
}
Insert cell
countTrees(testMap, 3, 1)
Insert cell
Insert cell
Insert cell
countTrees( parseInput(input), 3, 1 )
Insert cell
Insert cell
part2 = ( map ) => countTrees( map, 1, 1 ) * countTrees( map, 3, 1 ) * countTrees( map, 5, 1 ) * countTrees( map, 7, 1 ) * countTrees( map, 1, 2 );
Insert cell
part2( testMap );
Insert cell
part2( parseInput( input ) );
Insert cell

Purpose-built for displays of data

Observable is your go-to platform for exploring data and creating expressive data visualizations. Use reactive JavaScript notebooks for prototyping and a collaborative canvas for visual data exploration and dashboard creation.
Learn more