By Luke VanderHart
With greater than a hundred and fifty exact recipes, this cookbook exhibits skilled Clojure builders easy methods to clear up quite a few programming projects with this JVM language. The ideas disguise every thing from construction dynamic web content and dealing with databases to community verbal exchange, cloud computing, and complex checking out concepts. And greater than 60 of the world’s most sensible Clojurians contributed recipes.
Each recipe contains code that you should use right now, in addition to a dialogue on how and why the answer works, so that you can adapt those styles, methods, and methods to events now not particularly lined during this cookbook.
Master integrated primitive and composite facts structures
Create, advance and post libraries, utilizing the Leiningen tool
Interact with the neighborhood desktop that’s operating your application
Manage community verbal exchange protocols and libraries
Use innovations for connecting to and utilizing a number of databases
Build and preserve dynamic web pages, utilizing the hoop HTTP server library
Tackle software initiatives resembling packaging, dispensing, profiling, and logging
Take on cloud computing and heavyweight disbursed facts crunching
Dive into unit, integration, simulation, and property-based testing
Clojure Cookbook is a collaborative venture with contributions from a few of the world’s most sensible Clojurians, whose backgrounds diversity from aerospace to social media, banking to robotics, AI study to e-commerce.
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Extra info for Clojure Cookbook Recipes for Functional Programming
3. Divide the result by the number of values minus one. 4. 4142135623730951 Discussion Both mean and median are fairly easy to reproduce in Clojure, but mode requires a bit more effort. mode is a little different than mean or median in that it generally only makes sense for nonnumeric data. Calculating the modes of a collection is a little more involved and ultimately requires a good deal of processing compared to its numeric cousins. Here is a breakdown of how mode works: (defn mode [coll] (let [freqs (frequencies coll) ; occurrences (group-by second freqs) ; modes (last (sort occurrences)) ; modes (->> modes ; second (map first))] modes)) frequencies returns a map that tallies the number of times each value in coll occurs.
When passed a character match (such as \c or \n), replace expects a character replacement. Like string/string, the character/character mode of replace replaces items directly. When passed a regular expression for a match, replace gets much more interesting. One possible replacement for a regex match is a string, like in the linkify-comment example; this string interprets special character combinations like $1 or $2 as variables to be replaced by matching groups in the match. In the linkify-comment example, any contiguous digits (\d+) following a number sign (#) are captured in parentheses and are available as $1 in the replacement.
42827188432 Discussion It may be surprising to some that Clojure doesn’t have its own internal math namespace, but why reinvent the wheel? Despite its tainted reputation, Java can perform, especially when it comes to math. Math almost pleasant. Math isn’t only for trigonometry. It also contains a number of functions useful for dealing with exponentiation, logarithms, and roots. Math javadoc. 19. Inputting and Outputting Integers with Different Bases by Ryan Neufeld Problem You need to enter numbers into a Clojure REPL or code in a different base (such as hexadecimal or binary).