c# - Map and Reduce in .NET

Question

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

Is there a .NET implementation of this algorithm?

Answer 1

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.

• Map is Select:

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

• Reduce is Aggregate:

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

• Filter is Where:

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

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