By Luke VanderHart
With greater than one hundred fifty distinctive recipes, this cookbook exhibits skilled Clojure builders tips on how to clear up a number of programming projects with this JVM language. The suggestions disguise every little thing from development dynamic web pages and dealing with databases to community conversation, cloud computing, and complicated checking out options. And greater than 60 of the world’s most sensible Clojurians contributed recipes.
Each recipe comprises code for you to use right now, besides a dialogue on how and why the answer works, so that you can adapt those styles, methods, and methods to occasions now not particularly lined during this cookbook.
Master integrated primitive and composite facts structures
Create, boost and submit libraries, utilizing the Leiningen tool
Interact with the neighborhood desktop that’s working your application
Manage community conversation protocols and libraries
Use strategies for connecting to and utilizing various databases
Build and hold dynamic web content, utilizing the hoop HTTP server library
Tackle program projects similar to packaging, dispensing, profiling, and logging
Take on cloud computing and heavyweight dispensed information crunching
Dive into unit, integration, simulation, and property-based testing
Clojure Cookbook is a collaborative venture with contributions from a number of the world’s top 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
Since regular comparison won’t work, it’s necessary to use the compare function. The compare function takes two arguments and returns a number indicating that the first argument was either less than (-1), equal to (0), or greater than (+1) the second argument. 123-00:00") If you’ve been doing more complex work with dates and times and have Joda-Time objects in hand, then all of this still applies. coerce. 30. Calculating the Length of a Time Interval by Ryan Neufeld Problem You need to calculate the difference between two points in time.
Calling rationalize on any values that might possibly be doubles will allow you to maintain absolute accuracy (at the cost of performance). 15. Parsing Numbers by Ryan Neufeld Problem You need to parse numbers out of strings. 14 Discussion What is a “normal”-sized number? functions When the numbers you are parsing are either abnormally large or abnormally precise, you’ll need to parse them with BigInteger or BigDecimal to avoid losing precision. 16. Truncating and Rounding Numbers by Ryan Neufeld Problem You need to truncate or round a decimal number to a lower-precision number.
For this, clj-time includes a large number of built-in formatters. format/show-formatters to print out a list of built-in formats and a sample date/time in each format. format/formatters with its keyword to receive the appropriate DateTimeFormatter. By default, formatter always parses strings into DateTime objects with a UTC time zone. formatter optionally takes a time zone as its second argument. core/time-zone-for-id to receive a DateTimeZone object to pass to formatter. 28. Formatting Dates Using clj-time by Ryan Neufeld Problem You need to print dates or times in a particular format.
Clojure Cookbook Recipes for Functional Programming by Luke VanderHart