Added Lambda.foldi function.

[JaviCerveraIngram]

A version of Lambda.fold which also passes the element index to the folding function.

[kLabz]

Lambda already has fold

[JaviCerveraIngram]

I missed that one. It does not support passing the current index though, which is useful in many situations. What if I refactor this as foldi, and change the parameters so they are consistent with the ones in fold?

[RealyUniqueName]

What if I refactor this as foldi, and change the parameters so they are consistent with the ones in fold?

I think that could be a nice addition to Lambda

[JaviCerveraIngram]

I think that could be a nice addition to Lambda

Done.

[RealyUniqueName]

Please, add some tests to Lambda.unit.hx

[JaviCerveraIngram]

Please, add some tests to Lambda.unit.hx

Done :)

[RealyUniqueName]

Thanks