init commit

Author: YpsilonTM

.gitignore

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+node_modules

2023/01/code.ts

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+import fs from 'fs'
+
+const input = fs.readFileSync('./2023/01/input.txt', 'utf-8')
+
+const textNumbersRegex = new RegExp(['one', 'two', 'three', 'four', 'five', 'six', 'seven', 'eight', 'nine'].join('|'), 'g')
+
+function part1(input: string) {
+  const lines = input.split('\r\n')
+  const allDigitsRegex = /\d/g
+  const matches = lines
+    .map((line) => {
+      const digits = line.match(allDigitsRegex)
+      if (!digits) return
+      const first = digits?.[0]
+      const last = digits?.[digits.length - 1]
+      return first + last
+    })
+    .filter((value) => value)
+    .reduce((acc, value) => {
+      const number = parseInt(value || '0')
+      return acc + number
+    }, 0)
+  return matches
+}
+
+function part2(input: string) {
+  // get lines as array
+  const lines = input.split('\r\n')
+
+  // replace text numbers with digits
+  const parsedLines = lines.map((line) => {
+    const parsedLine = line.replace(textNumbersRegex, (match) => {
+      const number = ['one', 'two', 'three', 'four', 'five', 'six', 'seven', 'eight', 'nine'].indexOf(match) + 1
+      return number.toString()
+    })
+    return parsedLine
+  })
+
+  // get all digits
+  const allDigitsRegex = /\d/g
+  const matches = parsedLines
+    .map((line) => {
+      const digits = line.match(allDigitsRegex)
+      if (!digits) return 0
+      const first = digits?.[0]
+      const last = digits?.[digits.length - 1]
+      return Number(first + last) || 0
+    })
+    .filter((value) => value)
+    .reduce((acc, value) => {
+      return acc + value
+    }, 0)
+
+  return matches
+}
+
+console.log(part2(input))

2023/01/example.txt

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+two1nine
+eightwothree
+abcone2threexyz
+xtwone3four
+4nineeightseven2
+zoneight234
+7pqrstsixteen