在C#泛型列表扩展 [英] Generic List Extensions in C#
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问题描述
我写了一些扩展,以模仿地图和减少Lisp语言功能
I am writing a few extensions to mimic the map and reduce functions in Lisp.
public delegate R ReduceFunction<T,R>(T t, R previous);
public delegate void TransformFunction<T>(T t, params object[] args);
public static R Reduce<T,R>(this List<T> list, ReduceFunction<T,R> r, R initial)
{
var aggregate = initial;
foreach(var t in list)
aggregate = r(t,aggregate);
return aggregate;
}
public static void Transform<T>(this List<T> list, TransformFunction<T> f, params object [] args)
{
foreach(var t in list)
f(t,args);
}
转换功能将减少像克鲁夫特:
The transform function will cut down on cruft like:
foreach(var t in list)
if(conditions && moreconditions)
//do work etc
这是否有道理? ?难道是更好的。
Does this make sense? Could it be better?
推荐答案
这些看起来非常相似,在LINQ的扩展已经:
These look very similar to extensions in Linq already:
//takes a function that matches the Func<T,R> delegate
listInstance.Aggregate(
startingValue,
(x, y) => /* aggregate two subsequent values */ );
//takes a function that matches the Action<T> delegate
listInstance.ForEach(
x => /* do something with x */);
为什么第二个例子称为转换?你打算以某种方式更改列表中的值?如果是这样的情况下,你可以使用会更好 ConvertAll< T>
或选择< T>
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