What is the best way to use the enrichment library in scala?

Question

These are two different ways to implement it.

One shorter

implicit def toR1(s:String) = new { def getLength = s.length)} 

The second is longer

 class R2(s:String){def getLength2 = s.length)} implicit def toR2(s:String) = new R2(s) 

Which one is better?

Answer 1

The first version uses a structural type . This allows you to write short and readable code, but the drawback of structural types is that reflection is used at run time when you call a method in a structural type. Calling a method using reflection is slower than calling a method directly.

More on this blog post (written by me): Avoid structural types when pimping libraries