Download Clojure Programming: Practical Lisp for the Java World by Chas Emerick PDF

By Chas Emerick

Clojure is a realistic, general-purpose language that gives expressivity rivaling different dynamic languages like Ruby and Python, whereas seamlessly profiting from Java libraries, companies, and all the assets of the JVM surroundings. This e-book is helping you study the basics of Clojure with examples touching on it to the languages you recognize already, within the domain names and issues you're employed with on a daily basis. See how this JVM language can assist cast off pointless complexity out of your programming perform and open up new concepts for fixing the main difficult difficulties.

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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. core. info 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.

If you really need a “mutable” local binding, Clojure provides a raft of reference types that enforce specific mutation semantics; see “Clojure Reference Types” on page 170. 2. let’s binding vector is interpreted at compile time to provide optional destructuring of common collection types. Destructuring can aid substantially in eliminating certain types of verbose (and frankly, dull) code often associated with working with collections provided as arguments to functions. info abstractions. Many Clojure functions accept and return seqs and maps generally— rather than specific implementations—and most Clojure libraries and applications are built up relying upon these abstractions instead of particular concrete structures, classes, and so on.

Date. Date. com", :exp-date #} The make-user function strictly requires only one argument, a username. The rest of the arguments are assumed to be keyword/value pairs, gathered into a map, and then destructured using the map destructuring form following &. In the map destructuring form, we define a default of “now” for the join-date value. Calling make-user with a single argument returns the user map, populated with defaulted join- and expiration-date values and a nil email value since none was provided in the keyword arguments.

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