Home Java • Download Clojure Programming by Chas Emerick, Brian Carper, Christophe Grand PDF

Download Clojure Programming by Chas Emerick, Brian Carper, Christophe Grand PDF

By Chas Emerick, Brian Carper, Christophe Grand

Clojure is a realistic, general-purpose language that provides expressivity rivaling different dynamic languages like Ruby and Python, whereas seamlessly profiting from Java libraries, prone, and all the assets of the JVM environment. This publication is helping you examine the basics of Clojure with examples pertaining to it to the languages you recognize already, within the domain names and themes you're employed with each day. See how this JVM language might help get rid of pointless complexity out of your programming perform and open up new recommendations for fixing the main not easy problems.

Clojure Programming demonstrates the language’s flexibility by means of exhibiting the way it can be utilized for universal initiatives like internet programming and dealing with databases, up via extra not easy functions that require secure, powerful concurrency and parallelism, facts research, and extra. This in-depth glance is helping tie jointly the total Clojure improvement adventure, from how one can arrange your venture and an creation to Clojure construct tooling, to an educational on easy methods to utilize Clojure’s REPL in the course of improvement, and the way to install your accomplished software in a cloud environment.

* tips on how to use Clojure whereas leveraging your funding within the Java platform
* comprehend some great benefits of Clojure as a good Lisp for the JVM
* See how Clojure is used this day in numerous functional domain names
* observe how Clojure gets rid of the necessity for plenty of verbose and complex layout styles
* install huge or small internet functions to the cloud with Clojure

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Additional info for Clojure Programming

Example text

Since we only just created this new namespace foo, it doesn’t have a mapping for the x symbol, so attempting to resolve it fails. You need to know how to create, define, organize, and manipulate namespaces in order to use Clojure effectively. There is a whole suite of functions for this; please refer to “Defining and Using Namespaces” on page 322 for our guidelines in their use. We mentioned earlier that namespaces also map between symbols and imported Java classes. lang package are imported by default into each Clojure namespace, and so can be referred to without package qualification; to refer to unimported classes, a package-qualified symbol must be used.

Python is a language that supports this usage pervasively, where every argument may be named and provided in any order in a function call, and argument defaults can be provided when a function is defined. Special Forms | 39 Because keyword arguments are built using let’s map destructuring, there’s nothing stopping you from destructuring the rest argument map using types of key values besides keywords (such as strings or numbers or even collections). For example: (defn foo [& {k ["m" 9]}] (inc k)) ;= #'user/foo (foo ["m" 9] 19) ;= 20 ["m" 9] is being treated here as the name of a “keyword” argument.

Core. core$filter@7444f787> 22 | Chapter 1: Down the Rabbit Hole These are just the barest basics of how Clojure namespaces work; learn more about them and how they should be used to help you structure your projects in “Defining and Using Namespaces” on page 322. Symbol Evaluation With a basic understanding of namespaces under our belt, we can turn again to the example average function from Example 1-2 and have a more concrete idea of how it is evaluated: (defn average [numbers] (/ (apply + numbers) (count numbers))) As we learned in “Homoiconicity” on page 9, this is just a canonical textual representation of a Clojure data structure that itself contains other data.

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