advent of code 2023 day 14 part II

2023/14/impl.js

@@ -1,6 +1,23 @@
 
-const tilt = (map) => {
+const tilt = (originalMap) => {
+	// All 'O's should fall from south all the way to north until they hit (a) another one or (b) the bounds.
+	const theMap = originalMap.map(line => line.split(''))
+	const executeTilt = () => {
+		let tilted = false
+		theMap.forEach((row, rownr) => {
+			row.forEach((val, colnr) => {
+				if(val === 'O' && rownr - 1 >= 0 && theMap[rownr - 1][colnr] === '.') {
+					theMap[rownr][colnr] = '.'
+					theMap[rownr - 1][colnr] = 'O'
+					tilted = true
+				}
+			})
+		})
+		if(tilted) executeTilt() // as long as rocks are rollin', keep on rollin'
+	}
 
+	executeTilt()
+	return theMap.map(line => line.join(''))
 }
 
 const calculateLoad = (map) => {

2023/14/test.js

@@ -27,7 +27,8 @@ O..#.OO...
 #....###..
 #....#....`
 
-	assert.equal(expected, tilt(input.split('\n')))
+	const result = tilt(input.split('\n')).join('\n')
+	assert.equal(expected, result)
 })
 
 test('The total load of the platform calculated is based on the rock positions', (t) => {
@@ -45,7 +46,6 @@ O..#.OO...
 	assert.equal(136, calculateLoad(rolledNorth.split('\n')))
 })
 
-/*
 test('The result of the input solved from the example is 136', (t) => {
 		const input = `O....#....
 O.OO#....#
@@ -60,4 +60,4 @@ O.#..O.#.#
 
 	assert.equal(136, solve(input))
 })
-*/
+