F# 显式匹配 vs 函数语法 [英] F# explicit match vs function syntax

问题描述

抱歉标题模糊，但这个问题的一部分是这两种语法样式的名称:

Sorry about the vague title, but part of this question is what these two syntax styles are called:

let foo1 x = 
    match x with
    | 1 -> "one"
    | _ -> "not one"

let foo2 = function 
    | 1 -> "one" 
    | _ -> "not one"

另一部分是两者之间有什么区别，我什么时候想使用其中一个?

The other part is what difference there is between the two, and when I would want to use one or the other?

推荐答案

匹配版本称为模式匹配表达式".函数版本被称为模式匹配函数".在 spec 的第 6.6.4 节中找到.

The match version is called a "pattern matching expression". The function version is called a "pattern matching function". Found in section 6.6.4 of the spec.

两者兼而有之是一种风格问题.当我需要定义一个只是匹配语句的函数时，我更喜欢只使用函数版本.

Using one over the other is a matter of style. I prefer only using the function version when I need to define a function that is only a match statement.

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