Design Snake Game

Description

null

Solution(javascript)

/**
 * Initialize your data structure here.
        @param width - screen width
        @param height - screen height
        @param food - A list of food positions
        E.g food = [[1,1], [1,0]] means the first food is positioned at [1,1], the second is at [1,0].
 * @param {number} width
 * @param {number} height
 * @param {number[][]} food
 */
const SnakeGame = function (width, height, food) {
  this.body = [[0, 0]]
  this.foodIndex = 0
  this.width = width
  this.height = height
  this.score = 0
  this.food = food
}

/**
 * Moves the snake.
        @param direction - 'U' = Up, 'L' = Left, 'R' = Right, 'D' = Down
        @return The game's score after the move. Return -1 if game over.
        Game over when snake crosses the screen boundary or bites its body.
 * @param {string} direction
 * @return {number}
 */
SnakeGame.prototype.move = function (direction) {
  let [row, column] = this.body[this.body.length - 1]
  if (direction === 'U') { // 需要考虑上下移动么
    row -= 1
  } else if (direction === 'D') {
    row += 1
  } else if (direction === 'R') {
    column += 1
  } else {
    column -= 1
  }
  if (row < 0 || row > this.height - 1 || column < 0 || column > this.width - 1) {
    return -1
  }
  const index = this.body.findIndex(([x, y]) => x === row && y === column)

  if (index > 0) {
    return -1
  }
  this.body.push([row, column])
  if (this.food[this.foodIndex]
    && this.food[this.foodIndex][0] === row
    && this.food[this.foodIndex][1] === column) {
    this.foodIndex++
    return ++this.score
  }
  this.body.shift()
  return this.score
}

/**
 * Your SnakeGame object will be instantiated and called as such:
 * var obj = new SnakeGame(width, height, food)
 * var param_1 = obj.move(direction)
 */