day 2 part 1

solutions/01.ts

@@ -7,9 +7,12 @@ class DayOne implements Solvable {
     input = readInput('01')
 
     public part1(): DayOne {
-        const vals = this.input.trim().split("\n").map(line => line.split('   '))
-        const left  = vals.map(line => Number.parseInt(line[0])).sort()
-        const right = vals.map(line => Number.parseInt(line[1])).sort()
+        const vals = this.input
+            .trim()
+            .split("\n")
+            .map(line => line.split('   ').map(col => Number.parseInt(col)))
+        const left  = vals.map(line => line[0]).sort()
+        const right = vals.map(line => line[1]).sort()
         
         const diff: number[] = []
         left.forEach((left, idx) => {

solutions/02.ts

@@ -7,7 +7,34 @@ class DayTwo implements Solvable {
     input = readInput('02')
 
     public part1(): DayTwo {
-        console.log("test")
+        const reports = this.input.trim().split("\n").map(line => line.split(' ').map(level => Number.parseInt(level)))
+        const slidingWindow = (levels: number[]): boolean => { 
+            const gradients: ("ascending" | "descending")[] = []
+            let [i,j] = [0,1]
+            while (j < levels.length) {
+                // is unsafe if ascent / descend bigger than 3 or smaller than 1
+                const diff = Math.abs(levels[i] - levels[j])
+                if (diff > 3 && diff < 1) {
+                    return false
+                }
+                // calculate positive or negative gradient
+                if (levels[i] < levels[j]) {
+                    gradients.push("ascending") 
+                } else if (levels[i] > levels[j]) {
+                    gradients.push("descending")
+                } else {
+                    return false
+                }
+                i++
+                j++
+            }
+            // is safe and constant gradient?
+            const constantGradient = gradients.every((gradient) => gradient === "ascending") || gradients.every((gradient) => gradient === "descending")
+            return constantGradient
+        }
+        const result = reports.map(levels => slidingWindow(levels)).filter(level_safe => level_safe === true).length
+        console.log(result)
+
         return this
     }
     public part2(): DayTwo {