2023 01 ts

2023/01/README.md

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+# 01
+
+- First, in the B, was replacing all letters, which did work for the test data, but not the input. Then I just actually searched fof the first and last occurrence.
+
+<details>
+  <summary>Solutions</summary>
+  <ol>
+    <li>54605</li>
+    <li>55429</li>
+  </ol>
+</details>

2023/01/typescript/main.ts

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+import fs from 'node:fs'
+import path from 'node:path'
+
+// SETUP
+const INPUT = fs.readFileSync(path.join(import.meta.dir, '../input.txt'), 'utf-8').trim()
+const TEST = fs.readFileSync(path.join(import.meta.dir, '../test.txt'), 'utf-8').trim()
+
+// TASK
+
+function partA(input: string) {
+  const total = input
+    .split('\n')
+    .map((line) => {
+      const digits = line.split('').filter((c) => /\d/.test(c))
+      return parseInt(digits[0]! + digits[digits.length - 1])
+    })
+    .reduce((acc, cur) => acc + cur, 0)
+  console.log(total)
+}
+
+function partB(input: string) {
+  const names = ['one', 'two', 'three', 'four', 'five', 'six', 'seven', 'eight', 'nine']
+  const total = input
+    .split('\n')
+    .map((line) => {
+      let first = 0
+      let last = 0
+      root: for (let i = 0; i < line.length; i++) {
+        for (const [num, name] of names.entries()) {
+          const asString = (num + 1).toString()
+          if (line[i] === asString || line.slice(i).startsWith(name)) {
+            first = num + 1
+            break root
+          }
+        }
+      }
+
+      root: for (let i = line.length; i >= 0; i--) {
+        for (const [num, name] of names.entries()) {
+          const asString = (num + 1).toString()
+          if (line[i] === asString || line.slice(i).startsWith(name)) {
+            last = num + 1
+            break root
+          }
+        }
+      }
+
+      return last + 10 * first
+    })
+    .reduce((acc, cur) => acc + cur, 0)
+  console.log(total)
+}
+
+console.log('Part A:')
+partA(TEST)
+partA(INPUT)
+
+console.log('Part B:')
+partB(TEST)
+partB(INPUT)