Clojure Applied: From Practice to Practitioner by Ben Vandgrift

By Ben Vandgrift

Imagine within the Clojure method! as soon as you are accustomed to Clojure, take your next step with prolonged classes at the top practices and most important judgements you will need to make whereas constructing. the best way to version your area with facts, rework it with natural capabilities, deal with nation, unfold your paintings throughout cores, and constitution apps with elements. notice easy methods to use Clojure within the genuine international, and liberate the rate and gear of this gorgeous language at the Java digital desktop.

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If no match is made, nil is returned. The use of some for this purpose is common, but it breaks down in the specific cases of searching for nil or false, which are logically false. clj (defn contains-val? [coll val] (reduce (fn [ret elem] (if (= val elem) (reduced true) ret)) false coll)) (contains-val? units :oz) ;;=> true We’ll cover the use of reduce and reduced in detail in Reducing to a Value, on page 49. Now that we’ve decided how to make the best use of Clojure’s provided collections, we also want to consider how to solve problems unique to our own application by considering how to build our own collections.

We need to transform that sequential collection of Planets to a sequential collection of orbital periods for each Planet. The orbital period is the time the planet will take for one complete orbit around the Sun. 25 days. We can write a function to calculate the orbital period of any planet. Understanding the details of this function is not particularly important. (If you are interested the equation is shown here. info μ = GM T = 2π 3 a μ report erratum • discuss Mapping Values • 45 This value depends not only on the planet in question, but also on the mass of the central star.

If we were using maps instead of records, we would instead extract a type attribute with (:type entity) as the dispatch function. Once the dispatch function is invoked with an entity to produce a type, that type is matched with the available defmethod implementations, and the Recipe or Ingredient function implementation is invoked. Now consider how we might implement this same functionality with protocols. Protocols are also defined in two steps. First, the defprotocol form declares the name and a series of function signatures (but no function implementations).

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