checkerboard.js

// Josh Sandlin <josh@thenullbyte.org>
// Code for WDI-Fundamentls Exercises: 6.1.1, 6.2.1, 6.3.1
// Linted with the Standard JS Linter

var checkerboard = [
  [null, null, null, null, null, null, null, null],
  [null, null, null, null, null, null, null, null],
  [null, null, null, null, null, null, null, null],
  [null, null, null, null, null, null, null, null],
  [null, null, null, null, null, null, null, null],
  [null, null, null, null, null, null, null, null],
  [null, null, null, null, null, null, null, null],
  [null, null, null, null, null, null, null, null]
]

// eh
function setSquare (player, row, col) {
  checkerboard[row - 1][col - 1] = player
}

// eh
function getPieceAt (row, col) {
  return checkerboard[row - 1][col - 1]
}

// good
function clearBoard (board) {
  return board.map(function (row) {
    return row.map(function (col) {
      return null
    })
  })
}

// good
function setUpSide (player, row, col) {
  if (row % 2 === 0) {
    if (col % 2 === 0) {
      return player
    } else {
      return null
    }
  } else {
    if (col % 2 !== 0) {
      return player
    } else {
      return null
    }
  }
}

// good
function setUpRed (row, col) {
  return setUpSide('R', row, col)
}

// good
function setUpBlack (row, col) {
  return setUpSide('B', row, col)
}

// good
function setUpBoard (board) {
  return board.map(function (row, row_index) {
    return row.map(function (col, col_index) {
      if (row_index <= 2) {
        // set up red half
        return setUpRed(row_index, col_index)
      } else if (row_index >= 5) {
        // set up black half
        return setUpBlack(row_index, col_index)
      } else {
        return null
      }
    })
  })
}

// ----- check our work ----- //

var checkerboard = setUpBoard(checkerboard)
console.log(checkerboard)

var pieces = {}
pieces['red'] = []
pieces['black'] = []

for (var i = 0; i <= 7; i++) {
  for (var j = 0; j <= 7; j++) {
    if (checkerboard[i][j] === 'R') {
      pieces['red'].push([i, j])
    } else if (checkerboard[i][j] === 'B') {
      pieces['black'].push([i, j])
    }
  }
}

console.log(pieces['red'].map(function (piece) {
  var row = piece[0]
  var col = piece[1]
  return checkerboard[row][col] === 'R'
}))

console.log(pieces['black'].map(function (piece) {
  var row = piece[0]
  var col = piece[1]
  return checkerboard[row][col] === 'B'
}))

[ [ 'R', null, 'R', null, 'R', null, 'R', null ],
  [ null, 'R', null, 'R', null, 'R', null, 'R' ],
  [ 'R', null, 'R', null, 'R', null, 'R', null ],
  [ null, null, null, null, null, null, null, null ],
  [ null, null, null, null, null, null, null, null ],
  [ null, 'B', null, 'B', null, 'B', null, 'B' ],
  [ 'B', null, 'B', null, 'B', null, 'B', null ],
  [ null, 'B', null, 'B', null, 'B', null, 'B' ] ]
[ true, true, true, true, true, true, true, true, true, true, true, true ]
[ true, true, true, true, true, true, true, true, true, true, true, true ]