day 03 part 2 finished

2023/day03/index.js

@@ -14,23 +14,59 @@ for (let y = 0; y < lines.length; y++) {
         structureMap.push({ name: struct[0], x: struct.index, y: y })
     })
 }
+
+// --- part 1 ---------------------------------------------------------
 for (let y = 0; y < lines.length; y++) {
     const found_numbers = [...lines[y].matchAll(filter_data)]
     found_numbers.forEach(number => {
         let result = false
-        console.log(`-------- ${number[0]}`)
         result = isStructAroundMe(lines, { line: lines[y], y: y, x: number.index, xEnd: number.index + number[0].length - 1 })
-        if (result) res += parseInt(number[0])
-        if (!result) console.log(`
-
-            ${number[0]} has no adjacent parts!
-            
-            `)
+        res += result ? parseInt(number[0]) : 0
     })
 }
-console.log(structureMap)
 console.log(res)
 
+// --- part 2 ---------
+console.log(`part2`.padEnd(30, '-'))
+let result2 = 0
+structureMap.filter(struct => struct.name === '*').forEach(structure => {
+    const neighbours = findNeighbours(structure)
+    result2 += neighbours.length === 2 ? neighbours.reduce((cur, next) => cur * next) : 0
+
+})
+console.log(result2)
+function findNeighbours(structure) {
+    const directions = getDirections(structure.x, structure.y)
+    let chars = []
+    directions.forEach(direction => {
+        let char = lines[direction.y][direction.x]
+        if (!isNaN(char)) {
+            let re = new RegExp("(([0-9]+)?" + char + "([0-9]+)?)", "gm")
+            chars.push(parseInt([...lines[direction.y].matchAll(re)].find(number => direction.x <= (number.index + number[0].length - 1))[0]))
+        }
+    })
+    chars = [...new Set(chars)]
+    return chars
+}
+function getNumberFromLine(line) {
+    "".match()
+}
+function getDirections(x, y) {
+    const directions = [...new Set([
+        { x: Math.max(0, x - 1), y: Math.max(0, y - 1) },
+        { x: x, y: Math.max(0, y - 1) },
+        { x: Math.min(lines[0].length - 1, x + 1), y: Math.max(0, y - 1) },
+        { x: Math.max(0, x - 1), y: y },
+        { x: Math.min(lines[0].length - 1, x + 1), y: y },
+        { x: Math.max(0, x - 1), y: Math.min(lines.length - 1, y + 1) },
+        { x: x, y: Math.min(lines.length - 1, y + 1) },
+        { x: Math.min(lines[0].length - 1, x + 1), y: Math.min(lines.length - 1, y + 1) }
+    ])]
+    return directions
+}
+
+// -----
+
 function findStructure(lines, x, y) {
     if (!lines) return false
     let result = structureMap.find(coords => coords.x === x && coords.y === y) ? true : false