在F＃中将字符串列表转换为浮点数/整数 [英] Converting a list of strings into floats/ints in F#

问题描述

是否有一种快速简单的方法将整个字符串列表转换为浮点数或整数
并将它们像F＃中那样加在一起？

Is there a quick and simple way to convert an entire list of strings into floats or integers and add them together similar to this in F#?

foreach(string s in list)
{
    sum += int.Parse(s);
}

推荐答案

类似的东西应该具有相同的效果：

Something like this should have the same effect:

let sum = list |> Seq.map System.Int32.Parse |> Seq.sum

F＃似乎不支持引用上的方法int ，所以我不得不使用 System.Int32 。

F# doesn't seem to support referring to the method on int so I had to use System.Int32 instead.

在F＃中，该类型 seq 是.NET IEnumerable 的别名，因此此代码适用于数组，列表等。

In F# the type seq is an alias for the .NET IEnumerable, so this code works on arrays, lists etc.

请注意以无点样式使用 Parse -没有参数的函数可以直接用作另一个需要该类型的函数。在这种情况下， Seq.map 具有以下类型：

Note the use of Parse in "point-free" style - a function without its argument can be used directly as an argument to another function that expects that type. In this case Seq.map has this type:

('a -> 'b) -> seq<'a> -> seq<'b>

由于 System.Int32.Parse 具有输入 string-> int ， Seq.map System.Int32.Parse 具有类型 seq< string> -> seq< int> 。

And since System.Int32.Parse has type string -> int, Seq.map System.Int32.Parse has type seq<string> -> seq<int>.

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