Question

我试图获得从最高到最小的山峰排序，但在尝试打印时，我得到了

TypeError: mountainArray[i] is undefined

我认为我没有错过解决方案的任何步骤，但我未定义。

提前致谢

以下代码：

＆＃13;

var position;
var height;

function Mountain(position, height) {
  this.position = position;
  this.height = height;
}

function sortMountain(a, b) {
  return b.height - a.height;
}

var mountainArray = [];

// game loop
while (true) {
  for (var i = 0; i < 8; i++) {
    var mountainH = parseInt(readline()); // represents the height of one mountain, from 9 to 0.

    mountainArray.push(Mountain(i, mountainH));
    mountainArray.sort(sortMountain);


  }
  for (var i = 0; i < 8; i++) {
    print(mountainArray[i].position);
  }
}

＆＃13;

Answer 1

你上课的方式：

function Mountain(position, height) {
  this.position = position;
  this.height = height;
}

推送时需要使用new关键字：

while (true) {
  for (var i = 0; i < 8; i++) {
    var mountainH = parseInt(readline()); // represents the height of one mountain, from 9 to 0.

    mountainArray.push(new Mountain(i, mountainH)); // HERE
    mountainArray.sort(sortMountain);


  }
  for (var i = 0; i < 8; i++) {
    print(mountainArray[i].position);
  }
}

正如评论中所指出的那样，你应该只排序一次，不需要每次循环都这样做。

推送

1 个答案: