Andres Moreno

Hi, Daniel! Great book! A small correction. You write (p. 118 of the printed version) > Given this board, positions 1, 6, and 11 have valid moves, but all others...

Creating histograms is a very common activity. Geni offers [`cut`](https://github.com/zero-one-group/geni/blob/develop/src/clojure/zero_one/geni/core/foreign_idioms.clj#L158) which supports the creation of histograms as a function of `bins`, an array of values, but the user has to...

Geni users would benefit from support for Spark User Defined Functions on dataframes as documented [here](https://spark.apache.org/docs/latest/sql-ref-functions-udf-scalar.html). UDFs are very useful for data analysis from the simple classification of continuous values...

`racket-mode` is an Emacs mode for Racket and is an excellent alternative to `Geiser`

`raco pkg` is a package manager for Racket. The `raco` ecosystem provides a wealth of facilities for Racket

The documentation lists ` [org.dhatim/fastexcel-reader "0.12.8" :exclusions [org.apache.poi/poi-ooxml]]` as a required dependency. Using this dependency results in a reflection warning. The documentation should be updated to require ``` org.dhatim/fastexcel-reader {:mvn/version...