Read e-book online Clojure Applied: From Practice to Practitioner PDF

By Ben Vandgrift

Imagine within the Clojure means! as soon as you are conversant in Clojure, take your next step with prolonged classes at the most sensible practices and most important judgements you will want to make whereas constructing. how to version your area with information, rework it with natural capabilities, deal with country, unfold your paintings throughout cores, and constitution apps with elements. observe the way to use Clojure within the genuine international, and liberate the rate and tool of this pretty language at the Java digital desktop.

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Instead, sequential collections largely add and remove elements at the collection’s insertion point. However, the internal contents of a map are frequently updated, and maps need to be transformed in some common ways. Updating Maps The basic tools for modifying maps are assoc and dissoc. The assoc function updates the value for a key if it’s supplied with a new value. 7 adds an update function that can transform the value at a key based on applying a function. 97219e24 152098232 147098290 ;; ;; ;; ;; km^3 kg km, farthest from sun km, closest to sun Consider adding the capability for a user to investigate the effects of adding a moon to the simulation.

Data isn’t locked inside objects but is available for annotation and processing. Finally, you saw how to use protocols and multimethods to create generic domain operations. Generic domain operations allow us to make well-factored, extensible systems that can grow with our domain as we add both new types and new operations. Next, you’ll learn about Clojure’s constructs for operating on groups of entities or other values: collections, sequences, and beyond. info report erratum • discuss CHAPTER 2 Collect and Organize Your Data Clojure collections are the primary means of aggregating data in Clojure and are used at all levels of a Clojure application.

Info report erratum • discuss Wrapping Up • 41 The print apparatus is an open system with multimethods that define hooks to supply custom printers. The two hooks to consider are print- method (called when printing is done for the user) and print- dup (called when printing is done for the reader). For example, Clojure strings are printed by print-method without their surrounding quotes but in print-dup with their surrounding quotes. Pair") (print-method (vec (seq pair)) w)) (defmethod print-dup Pair [pair w] (print-method pair w)) As a shortcut, in our printer we simply convert the Pair data to a vector and lean on the existing vector print-method support.

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