By Chas Emerick
Clojure is a realistic, general-purpose language that provides expressivity rivaling different dynamic languages like Ruby and Python, whereas seamlessly making the most of Java libraries, companies, and all the assets of the JVM atmosphere. This booklet is helping you examine the basics of Clojure with examples bearing 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 may also help dispose of pointless complexity out of your programming perform and open up new suggestions for fixing the main difficult difficulties.
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Additional info for Clojure Programming: Practical Lisp for the Java World
Its syntax is simple: if the value of the first expression in an if form is logically true, then the result of the if form is the value of the second expression. Otherwise, the result of the if form is the value of the third expression, if provided. The second and third expressions are only evaluated as necessary. 32 Many refinements are built on top of if, including: • when, best used when nil should be returned (or no action should be taken) if a condition is false. • cond—similar to the else if construction in Java and Ruby, and elif in Python— allows you to concisely provide multiple conditions to check, along with multiple then expressions if a given conditional is true.
Numbers Clojure provides a plethora of numeric literals (see Table 1-2). Many of them are pedestrian, but others are rare to find in a general-purpose programming language and can simplify the implementation of certain algorithms—especially in cases where the algorithms are defined in terms of particular numeric representations (octal, binary, rational numbers, and scientific notation). info While the Java runtime defines a particular range of numeric primitives, and Clojure supports interoperability with those primitives, Clojure has a bias toward longs and doubles at the expense of other widths, including bytes, shorts, ints, and floats.
This eliminates a source of common errors and bugs without sacrificing capability: • The loop and recur special forms provide for looping cases where values need to change on each cycle of a loop; see “Looping: loop and recur” on page 43. • 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.
Clojure Programming: Practical Lisp for the Java World by Chas Emerick