在F#中乘以字符串 [英] Multiplying a string in F#

问题描述

我有一个不确定的问题.

I have a question I am rather unsure about.

我的问题如下

let myFunc (text:string) (times:int) = ....

我希望此函数执行的操作是将字符串按times参数指定的次数放置在一起.

What I want this function to do is put the string together as many times as specified by the times parameter.

if input = "check " 3我想要输出字符串= "check check check"

if input = "check " 3 I want the output string = "check check check"

我尝试了一个循环，但似乎无法使其正常工作.

I have tried with a loop, but couldn't seem to make it work.

有人吗?

推荐答案

实际上，该功能已经在字符串模块:

Actually the function is already in String module:

let multiply text times = String.replicate times text

要编写自己的函数，一种有效的方法是使用StringBuilder:

To write your own function, an efficient way is using StringBuilder:

open System.Text

let multiply (text: string) times =
    let sb = new StringBuilder()
    for i in 1..times do
        sb.Append(text) |> ignore
    sb.ToString()

如果要删除示例中的结尾空格，可以使用String类中的Trim()成员来实现.

If you want to remove trailing whitespaces as in your example, you can use Trim() member in String class to do so.

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