developher-net · developher-net · Dec 14, 2021 · Dec 14, 2021 · Dec 14, 2021 · Dec 14, 2021
diff --git a/2021/day-04/bingo.js b/2021/day-04/bingo.js
@@ -0,0 +1,63 @@
+const markBoard = (board, called) => {
+  for (let x = 0; x < 5; x++) {
+    for (let y = 0; y < 5; y++) {
+      if (board[x][y] === called) {
+        board[x][y] = 'x'
+        // TODO: speed up break the loop, since only one of a number on each board
+        // x = 6
+        // y = 6
+      }
+    }
+  }
+  return board
+}
+
+const checkWinner = (board) => {
+  // TODO: This can be sped up by doing a check for at least 5 "x" before
+  // validating horizontal/vertical explicitly. Another speedup would be to
+  // zig-zag check parse through the array and break/resolve when there
+  // isn't a match instead of checking all columns then checking all rows
+
+  // Look for a horizontal bingo
+  for (let y = 0; y < 5; y++) {
+    if (board[y].filter((val) => val === 'x').length === 5) {
+      return 'winner'
+    }
+  }
+
+  // Look for a vertical bingo
+  let match = 0
+  for (let x = 0; x < 5; x++) {
+    for (let y = 0; y < 5; y++) {
+      if (board[y][x] === 'x') {
+        match++
+
+        if (match === 5) {
+          return 'winner'
+        }
+      }
+    }
+    match = 0 // reset so next row has a clean count
+  }
+
+  // No bingo
+  return 'no win'
+}
+
+const scoreBoard = (board) => {
+  return board.reduce((tally, row) => {
+    tally += row.reduce((colTally, cell) => {
+      if (cell !== 'x') {
+        colTally += cell
+      }
+      return colTally
+    }, 0)
+    return tally
+  }, 0)
+}
+
+module.exports = {
+  scoreBoard,
+  checkWinner,
+  markBoard
+}
diff --git a/2021/day-04/bingo.test.js b/2021/day-04/bingo.test.js
@@ -0,0 +1,106 @@
+/* eslint-env mocha */
+const { expect } = require('chai')
+const { scoreBoard, checkWinner, markBoard } = require('./bingo')
+const { parseData, linesToArray } = require('../../2018/inputParser')
+
+const testData = `
+7,4,9,5,11,17,23,2,0,14,21,24,10,16,13,6,15,25,12,22,18,20,8,19,3,26,1
+
+22 13 17 11  0
+ 8  2 23  4 24
+21  9 14 16  7
+ 6 10  3 18  5
+ 1 12 20 15 19
+
+ 3 15  0  2 22
+ 9 18 13 17  5
+19  8  7 25 23
+20 11 10 24  4
+14 21 16 12  6
+
+14 21 17 24  4
+10 16 15  9 19
+18  8 23 26 20
+22 11 13  6  5
+ 2  0 12  3  7
+`
+// Deep copy to ensure we aren't mutating the original data
+const data = JSON.parse(JSON.stringify(linesToArray(testData)))
+
+// split up data
+const testDraws = parseData(data.shift())
+console.debug(testDraws)
+const testBoards = []
+for (let x = 0; x < data.length; x = x + 5) {
+  testBoards.push(
+    data.slice(x, x + 5).map(parseData)
+  )
+}
+
+describe('--- Day 4: Giant Squid ---', () => {
+  describe('Part 1', () => {
+    describe('markBoard()', () => {
+      it('checks a board for a match and marks it', () => {
+        const board = [
+          [1, 2, 3, 4, 5],
+          [9, 8, 7, 6, 5],
+          ['x', 'x', 'x', 'x', 'x'],
+          [3, 6, 9, 1, 0],
+          [1, 3, 5, 7, 9]
+        ]
+        const expected = [
+          [1, 2, 3, 4, 'x'],
+          [9, 8, 7, 6, 'x'],
+          ['x', 'x', 'x', 'x', 'x'],
+          [3, 6, 9, 1, 0],
+          [1, 3, 'x', 7, 9]
+        ]
+        expect(markBoard(board, 5)).to.deep.equal(expected)
+      })
+    })
+    describe('checkWinner()', () => {
+      it('checks to see if a board has a horizontal bingo', () => {
+        const board = [
+          [1, 2, 3, 4, 5],
+          [9, 8, 7, 6, 5],
+          ['x', 'x', 'x', 'x', 'x'],
+          [3, 6, 9, 1, 0],
+          [1, 3, 5, 7, 9]
+        ]
+        expect(checkWinner(board)).to.equal('winner')
+      })
+      it('checks to see if a board has a vertical bingo', () => {
+        const board = [
+          [1, 2, 3, 'x', 5],
+          [9, 8, 7, 'x', 5],
+          [2, 4, 6, 'x', 8],
+          [3, 6, 9, 'x', 0],
+          [1, 3, 5, 'x', 7]
+        ]
+        expect(checkWinner(board)).to.equal('winner')
+      })
+      it('identifies a board is not yet a winner', () => {
+        const board = [
+          [1, 'x', 3, 4, 5],
+          [9, 8, 7, 'x', 5],
+          ['x', 'x', 3, 7, 11],
+          [3, 6, 9, 'x', 'x'],
+          [1, 3, 5, 7, 'x']
+        ]
+        expect(checkWinner(board)).to.equal('no win')
+      })
+    })
+    describe('scoreBoard()', () => {
+      it('gets the sum of the unmarked squares on the board', () => {
+        const board = [
+          ['x', 'x', 'x', 'x', 'x'],
+          [10, 16, 15, 'x', 19],
+          [18, 8, 'x', 26, 20],
+          [22, 'x', 13, 6, 'x'],
+          ['x', 'x', 12, 3, 'x']
+        ]
+        expect(scoreBoard(board)).to.equal(188)
+      })
+    })
+  })
+})
diff --git a/2021/day-04/index.js b/2021/day-04/index.js
@@ -0,0 +1,3 @@
+// eslint-disable-next-line no-unused-vars
+const console = require('../helpers')
+require('./solution')