字符转字符串功能 [英] Char to string function

问题描述

我有一个非常简单的问题:给定一个接受字符并返回字符串的函数

I have a very simple question: Given a function accepting a char and returning a string

test :: Char -> [String]

如何将char转换为字符串?我对这两种类型感到困惑.

how can one convert the char into a string? I'm confused over the two types.

推荐答案

在Haskell中，String是[Char]的别名:

In Haskell String is an alias for [Char]:

type String = [Char]

如果您只想要一个将单个char转换为字符串的函数，则可以例如做

If you just want a function that converts a single char to a string you could e.g. do

charToString :: Char -> String
charToString c = [c]

如果您喜欢无点样式，也可以编写

If you prefer pointfree style you could also write

charToString :: Char -> String
charToString = (:[])

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