.NET中的映射和精简 [英] Map and Reduce in .NET

问题描述

哪些情况需要使用"地图和约简"算法?

What scenarios would warrant the use of the "Map and Reduce" algorithm?

该算法是否有.NET实现?

Is there a .NET implementation of this algorithm?

推荐答案

Map和Reduce的Linq等效项: 如果您很幸运拥有linq，则无需编写自己的地图和简化函数. C#3.5和Linq已经有了不同的名称.

Linq equivalents of Map and Reduce: If you’re lucky enough to have linq then you don’t need to write your own map and reduce functions. C# 3.5 and Linq already has it albeit under different names.

• 地图为Select:

Enumerable.Range(1, 10).Select(x => x + 2);

缩小为Aggregate:

Enumerable.Range(1, 10).Aggregate(0, (acc, x) => acc + x);

过滤器为Where:

Enumerable.Range(1, 10).Where(x => x % 2 == 0);

https://www.justinshield.com/2011/06/mapreduce -in-c/

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