Day 01 Part 02

01/index.ts

@@ -1,11 +1,31 @@
 const fs = require('fs').promises;
 
 const input: string = (await fs.readFile('./input.txt')).toString()
+// const testInput = `two1nine
+// eightwothree
+// abcone2threexyz
+// xtwone3four
+// 4nineeightseven2
+// zoneight234
+// 7pqrstsixteen`
 
-console.log("Solution first part: " + partOne())
+const patterns: {[id: string]: string} = {
+	one: '1',
+	two: '2',
+	three: '3',
+	four: '4',
+	five: '5',
+	six: '6',
+	seven: '7',
+	eight: '8',
+	nine: '9'
+}
+
+console.log("Solution first part: " + partOne(input))
+console.log("Solution second part: " + partTwo(input))
 
 
-function partOne(): string {
+function partOne(input: string): string {
 	let digits = []
 	for (const line of input.split('\n')) {
 		let first = undefined
@@ -27,4 +47,20 @@ function partOne(): string {
 	return `${sum}`
 }
 
-function partTwo() {}
+function partTwo(input: string): string {
+	let fixedParts: Array<string> = []
+	
+	for (const line of input.split('\n')) {
+		let modified = line
+		for (const pattern of Object.keys(patterns)) {
+			let count = 0
+			for (const match of modified.matchAll(new RegExp(pattern, 'g'))) {
+				let pos = match.index! + count
+				modified = [modified.slice(0, pos), pattern[0], patterns[pattern], pattern[pattern.length], modified.slice(pos)].join('')
+				count += 3
+			}
+		}
+		fixedParts.push(modified)
+	}
+	return partOne(fixedParts.join('\n'))
+}