By Ben Vandgrift
Imagine within the Clojure manner! as soon as you are accustomed to Clojure, take the next move 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 facts, rework it with natural capabilities, deal with kingdom, unfold your paintings throughout cores, and constitution apps with elements. realize easy methods to use Clojure within the actual global, and unencumber the rate and gear of this pretty language at the Java digital computing device.
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Extra info for Clojure Applied: From Practice to Practitioner
6 The Prismatic Schema library describes type metadata as data, automates descriptions, and validates data at runtime against that metadata. 3"] Let’s look at how to describe some data with Schema in the context of our recipe-manager application. clj (defrecord Recipe [name ;; string description ;; string ingredients ;; sequence of Ingredient steps ;; sequence of string servings ;; number of servings ]) (defrecord Ingredient [name ;; string quantity ;; amount unit ;; keyword ]) 2. 3. 4. 5. 6. info report erratum • discuss Validating Entities • 17 We’ve added comments to these records to help our colleagues (and maybe ourselves a few months down the line) understand what we expect.
For example, deftypes get a type and constructor functions as records do, but they don’t automatically act like maps. With deftype, it’s our responsibility to implement the proper interfaces to act like a map if we need it. Types also have support for specialized features such as mutable and unsynchronized fields, which aren’t available in any other Clojure construct. info report erratum • discuss Chapter 2. valAt this k nil))) Inside the deftype we list each interface being implemented and then provide the method implementation.
Pair@39b4cec7"] Things went pretty well until we tried to look directly at p. We’ll fix that now. Custom Printing for Types As you just saw, types have a predefined print format that contains the name of the class and an identifier. We’d like the printed form of our type to contain the instance data. The reader is the component inside Clojure that reads a string and returns Clojure data. Ideally we’d like our type to print in a form that can be read by the reader—this gives us full round-trip capability as a literal value.