如何使用变体选项在 rescript 中键入函数参数?

问题描述

我想做以下事情。但似乎我无法使用变体选项之一键入函数参数。在 rescript 中实现这一目标的正确方法是什么?

Here is a playground

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    .render(document.getElementById('trust_chart'))
    .catch(() => window.alert('Chart Failed to initialise')); 
}

解决方法

TeacherStudent 本身不是类型,而是构造 person 类型值的构造函数。如果您希望它们具有不同的类型,则必须使其明确:

module University = {
  type subject = Math | History

  type teacher = {firstName: string,subject: subject}
  type student = {firstName: string}
  type person =
    | Teacher(teacher)
    | Student(student)
  
  let hasSameNameThanTeacher = (
    ~teacher: teacher,~student: student,) => {
    teacher.firstName == student.firstName
  }
}