在F#中使用无点样式的非对称算子的部分函数应用程序? [英] Partial function application for a non-symmetric operator using point-free style in F#?

问题描述

我如何为非对称运算符(例如模数运算符)的第一个参数创建偏函数应用程序，而F#中没有任何参数名称?我的第一次尝试是

How can I create a partial function application for a non-symmetric operator such as the modulus operator with regards to the first argument without any argument names in F#? My first attempt was

let mod10 = (%) 10当然可以翻译为

mod10(x) = 10 mod x而不是所需的

mod10(x) = x mod 10. 当然可以写

let mod10 x = (%)x 10，但我不想命名该参数，因此是否可以使用一些占位符，例如

let mod10 x = (%)x 10 but I'd like to not have to name the argument so is there some placeholder that can be used, something like

let mod10 = (%)_ 10?

推荐答案

您可以定义无点样式中常见的flip函数:

You can define flip function which is common in point-free style:

let inline flip f x y = f y x

并像这样使用它:

let (%-) = flip (%)
let mod10 = (%-) 10

或直接这样:

let mod10 = flip (%) 10

无点样式并不总是可读(如本例所示)，并且在F#编程中并不流行.

Point-free style is not always readable (as in this example) and not popular in F# programming.

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