F#:如何打印完整列表(Console.WriteLine()仅打印前三个元素) [英] F#: how to print full list (Console.WriteLine() prints only first three elements)

问题描述

是否可以不使用循环打印完整列表? 我试过了:

Is it possible to print full list without using cycle? I tried:

Console.WriteLine([1;2;3;4;5])

，它只打印三个前元素:

and it prints only three first elements:

[1;2;3; ... ]

推荐答案

如果要使用内置的F#格式化引擎(并避免自己实现同一功能)，则可以使用诸如printfn的F#打印功能. .您可以为其指定格式说明符，以打印整个列表(使用F#格式)或仅打印前几个元素(调用ToString时会发生这种情况):

If you want to use the built-in F# formatting engine (and avoid implementing the same thing yourself), you can use F# printing functions such as printfn. You can give it a format specifier to print an entire list (using F# formatting) or print just a first few elements (which happens when you call ToString):

> printfn "%A" [ 1 .. 5 ];;  // Full list using F# formatting 
[1; 2; 3; 4; 5]

> printfn "%O" [ 1 .. 5 ];;  // Using ToString (same as WriteLine)
[1; 2; 3; ... ]

如果出于某种原因要使用Console.WriteLine(或其他.NET方法)，也可以使用sprintf，其行为与printf类似，但返回格式化的字符串作为结果:

If you want to use Console.WriteLine (or other .NET method) for some reason, you can also use sprintf which behaves similarly to printf, but returns the formatted string as the result:

Console.WriteLine(sprintf "%A" list)

使用printf或sprintf的好处是它还会自动处理其他F#类型(例如，如果您有一个包含元组，已区分联合或记录的列表).

The benefit of using printf or sprintf is that it also automatically deals with other F# types (for example if you have a list containing tuples, discriminated unions or records).

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