arrays - F# - 定义对象数组

Question

我正在尝试为我正在做的项目创建一些示例数据。为此，我需要一个简单的对象结构，其中对象包含对象数组。在这种情况下，批评家可以进行评论。代码如下所示:

type Review = 
  { MovieName: string;
    Rating: double }

type Critic = 
  { Name: string;
    Ratings: Review[] }

let theReviews = [{ MovieName = "First Movie"; Rating = 5.5 }; { MovieName = "Second Movie"; Rating = 7.5 };]

let theCritic = { Name = "The Critic"; Ratings = [{ MovieName = "First Movie"; Rating = 5.5 }; { MovieName = "Second Movie"; Rating = 7.5 };]  }

“评论”行工作正常，但我无法让“theCritict”行工作。我收到的错误是:

Error 1 This expression was expected to have type Review []
but here has type 'a list

如何让它发挥作用？

Answer 1

数组文字使用[| ... |] 而不是 [ ... ] ，它们是列表文字 - 您需要类似

let theCritic = { Name = "The Critic"; Ratings = [|{ MovieName = "First Movie"; Rating = 5.5 }; { MovieName = "Second Movie"; Rating = 7.5 };|]  }

这解释了错误 - 您使用了列表文字而不是数组文字