feat(2023-01): generate checksums for trebuchet data

developher-net · developher-net · commit e436ac336b09 · 2023-12-04T09:04:57.000-08:00
diff --git a/2023/day-01/checksum.js b/2023/day-01/checksum.js
@@ -0,0 +1,22 @@
+/**
+ * Generates a checksum for a string by concatenating
+ * the first and last digits found in the string
+ * @param string containing a single line of data
+ */
+const checksumLine = (data) => {
+  data.replace(/([^0-9])+/g, '') // trim non-numeric characters
+  const checksumString = `${data[0]}${data[-1]}`
+  return parseInt(checksumString)
+}
+
+/**
+ * Generates the checksum for an entire set
+ * @param Arrray of lines containing data
+ */
+const checksumSet = (set) => {
+  return set.reduce((total, current) => {
+    return total + checksumLine(current)
+  }, 0)
+}
+
+module.exports = { checksumLine, checksumSet }
diff --git a/2023/day-01/checksum.test.js b/2023/day-01/checksum.test.js
@@ -0,0 +1,24 @@
+/* eslint-env mocha */
+const { expect } = require('chai')
+const { checksumSet, checksumLine } = require('./checksum')
+
+describe('--- Day 1: Trebuchet?! ---', () => {
+  describe('Part 1', () => {
+    describe('checksum', () => {
+      it('calculates the checksum for a string by concatentating the first and last number', () => {
+        // provided
+        expect(checksumLine('1abc2')).to.equal(12)
+        expect(checksumLine('pqr3stu8vwx')).to.equal(18)
+        expect(checksumLine('a1b2c3d4e5f')).to.equal(15)
+        expect(checksumLine('treb7uchet')).to.equal(77)
+      })
+    })
+    describe('checksumSet', () => {
+      it('calculates the checksum for a set of lines by summing the checksum of each line', () => {
+        // provided
+        const set = ['1abc2', 'pqr3stu8vwx', 'a1b2c3d4e5f', 'treb7uchet']
+        expect(checksumSet(set)).to.equal(142)
+      })
+    })
+  })
+})
diff --git a/2023/day-01/index.js b/2023/day-01/index.js
@@ -0,0 +1,3 @@
+// eslint-disable-next-line no-unused-vars
+const console = require('../helpers')
+require('./solution')
diff --git a/2023/day-01/input.txt b/2023/day-01/input.txt
diff --git a/2023/day-01/solution.js b/2023/day-01/solution.js
@@ -0,0 +1,35 @@
+const fs = require('fs')
+const path = require('path')
+const filePath = path.join(__dirname, 'input.txt')
+const { inputToArray } = require('../../2018/inputParser')
+
+fs.readFile(filePath, { encoding: 'utf8' }, (err, initData) => {
+  if (err) throw err
+
+  initData = inputToArray(initData.trim())
+
+  const resetInput = () => {
+    // Deep copy to ensure we aren't mutating the original data
+    return JSON.parse(JSON.stringify(initData))
+  }
+
+  const part1 = () => {
+    const data = resetInput()
+    console.debug(data)
+    return 'No answer yet'
+  }
+
+  const part2 = () => {
+    const data = resetInput()
+    console.debug(data)
+    return 'No answer yet'
+  }
+  const answers = []
+  answers.push(part1())
+  answers.push(part2())
+
+  answers.forEach((ans, idx) => {
+    console.info(`-- Part ${idx + 1} --`)
+    console.info(`Answer: ${ans}`)
+  })
+})

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,3 @@`
	`1`	`+// eslint-disable-next-line no-unused-vars`
	`2`	`+const console = require('../helpers')`
	`3`	`+require('./solution')`