feat(2021-day-08): generate codes for each possible number

2021/day-08/display.js

@@ -448,7 +448,8 @@ const descrambleSignal = (data) => {
   console.debug(segmentCodes)
 
   return {
-    segmentCodes
+    segmentCodes,
+    charCodes: sortedCodes
   }
 }
 

2021/day-08/display.test.js

@@ -2,8 +2,7 @@
 const { expect } = require('chai')
 const { descrambleSignal } = require('./display')
 
-const testSingle = `acedgfb cdfbe gcdfa fbcad dab cefabd cdfgeb eafb cagedb ab |
-cdfeb fcadb cdfeb cdbaf`
+const testSingle = 'acedgfb cdfbe gcdfa fbcad dab cefabd cdfgeb eafb cagedb ab | cdfeb fcadb cdfeb cdbaf'
 
 console.debug(
   testSingle.split('|')[0].trim()
@@ -17,11 +16,19 @@ describe('--- Day 8: Seven Segment Search ---', () => {
   describe('Part 1', () => {
     describe('descrambleSignal()', () => {
       const testData = testSingle.split('|')[0].trim()
-      const result = descrambleSignal(testData).segmentCodes
+      const { segmentCodes, charCodes } = descrambleSignal(testData)
 
       it('takes scambled string of 10 codes and identifies the letters matching each seven-digit-display segment', () => {
-        expect(result.length).to.equal(7)
-        expect(result.filter((code) => !['a', 'b', 'c', 'd', 'e', 'f', 'g'].includes(code)).length).to.equal(0)
+        expect(segmentCodes.length).to.equal(7)
+        expect(segmentCodes.filter((code) => !['a', 'b', 'c', 'd', 'e', 'f', 'g'].includes(code)).length).to.equal(0)
+      })
+
+      it('produces a list of character codes for each number that can be displayed', () => {
+        // There should be exactly 10 numbers
+        expect(charCodes.length).to.equal(10)
+        // lengths of each code is predictable as each number has a specific count of segments
+        const expectedLengths = [6, 2, 5, 5, 4, 5, 6, 3, 7, 6]
+        expect(charCodes.map(code => code.length)).to.deep.equal(expectedLengths)
       })
     })
   })