string - F# 字符串构建

Question

我想在 F# 中执行此 C# 代码

  string[] a = new string[5];
    string b = string.Empty;
    a[0] = "Line 1";
    a[2] = "Line 2";

    foreach (string c in a)
    {
        b = c + Environment.NewLine;
    }

Answer 1

使用内置的 String.Join 方法比基于重复的字符串连接滚动你自己的函数要好得多。这是 F# 中的代码:

open System
let a = [| "Line 1"; null; "Line 2"; null; null;|] 
let b = String.Join(Environment.NewLine, a)