Erik Rybakken

Add applyWhen :: Bool -> (a -> a) -> a -> a

3

Consider adding applyWhen from [here](https://hackage.haskell.org/package/ghc-8.10.1/docs/Util.html#v:applyWhen).

Example: Economist graphic

4

It would be a nice and fun challenge to try to reproduce this graphic from the Economist:  This [tutorial](http://tutorials.iq.harvard.edu/R/Rgraphics/Rgraphics.html) does it with ggplot2. I will try to do this...

decodeXls as a pure function, decodeXls :: ByteString -> [[[String]]] ?

5

Is there any fundamental reason that the decodeXls functions need to use IO to parse an xls file? In my use case I would like to decouple the parsing logic...