如何避免在F#中进行硬编码 [英] How to avoid hard coding in F#

问题描述

这里的最佳实践到底是什么-显然不支持#define，所以定义常量的最佳方法是什么，例如

What exactly is the best practice here - clearly #define isn't supported so what is best way to define constants like

SPACE =''

冒号=':'

STATE_START = 0

STATE_START = 0

STATE_IDENT = 1

STATE_IDENT = 1

STATE_COMMENT = 2

STATE_COMMENT = 2

等等等.

Thx

Cap'n

推荐答案

首先-我会想一想为什么要这些.  但是在F#中，每个值实际上已经是常量(因为默认情况下它们是不可变的)，所以我只使用:

First off - I'd think about why you want these in the first place.  But in F#, every value is effectively already constant (since they're immutable by default), so I'd just use:

let space = ' '
let colon = ':'

// Multiple "State"s sounds like a union to me...
type MyState =
  | Start
  | Ident
  | Comment

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