dart - 为什么即使在打印字符时控制台也为空？

Question

这是我在https://dartpad.dev上尝试过的简单的Dart代码。

void main(){  
  var numbers = new List(10);
  for(int i=0; i<=10; i++){
    numbers[i] = i;
  }
  print(numbers[1]);
  print("hello world");
}

为什么控制台为空？它不打印1或hello world。此代码有什么问题？

Answer 1

您的代码有一个index out of range error，也就是说，当您使用i<=10时，您会得到它。

1. Since, in your initialization of the List numbers, you have the length as 10, but due to i<=10, it will store the length of 11. Hence error.
2. The code will go from 0,1,2,3,4,5,6,7,8,9,10, which is in total 11 in number. INDEX OUT OF RANGE ERROR

Uncaught Error: RangeError (index): Index out of range: index should be less than 10: 10

如果您不希望出现错误，则只需要按以下方式创建数据:i<10。否则，请使用i=1; i<11 => 1,2,3,4,5,6,7,8,9,10

void main(){  
  var numbers = new List(10);
  for(int i=0; i<10; i++){
    numbers[i] = i;
  }
  print(numbers[1]);
  print("hello world");
}

输出

1
hello world