Clojure Reserved Keywords

Clojure Reserved, Clojure Reserved Words, Clojure Reserved Identifier, Clojure Keywords

Clojure Reserved Word, Clojure Reserved Identifiers, Clojure Keyword

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Also called: Clojure Language Keywords, Clojure Reserved Keywords, Clojure Keywords, Clojure Reserved Identifiers

Provide a glossary of the top 40 Clojure language Reserved Words sorted by the most commonly used. Include short Clojure code examples.

Creating a glossary of the top 40 Clojure reserved words sorted by their most common use involves subjective analysis, as “most commonly used” can vary depending on the specific domain or application. However, we can highlight some of the fundamental and widely used reserved words and special forms in Clojure, which are integral to functional programming and data manipulation in the language. Clojure's design emphasizes immutability, functional programming, and concise syntax, and the chosen reserved words reflect these principles.

Given the rich set of functionalities Clojure offers through its core library rather than a long list of reserved words, it's important to note that many critical operations in Clojure are actually functions in the standard library, not reserved words in the traditional sense found in languages like Java or C. However, there are several special forms and macros that are foundational to programming in Clojure.

Here's an attempt to outline these, formatted in MediaWiki markup:

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This glossary lists some of the most frequently used reserved words, special forms, and macros in Clojure, along with short code examples to illustrate their use.

Defines a new symbol (a variable) at the namespace level.

(def x 10)

Binds symbols to values in a local scope.

(let [x 5] (* x x))

Defines an anonymous function.

(fn [x] (* x x))

Defines a named function.

(defn square [x] (* x x))

Conditional branching based on a single condition.

(if (> x 5) "greater" "less or equal")

Executes a series of expressions and returns the value of the last.

(do (println "Hello") (println "World"))

Defines a loop with a body and bindings for iteration.

(loop [i 0] (when (< i 5) (recur (inc i))))

Recursively calls the nearest enclosing loop or function.

(loop [i 0] (when (< i 5) (recur (inc i))))

Prevents evaluation of a form, returning it as is.

(quote (1 2 3))

Defines a macro, which can manipulate and generate Clojure code.

(defmacro unless [test body] `(if (not ~test) ~body))

Executes body only if the condition is true.

(when (> x 5) (println "x is greater than 5"))

Adds an element to a collection.

(conj [1 2 3] 4)

Creates a sequence from a collection.

(seq [1 2 3])

Returns the first item in the collection.

(first [1 2 3])

Returns a sequence of all but the first item in the collection.

(rest [1 2 3])

Applies a function to the arguments contained in a list or vector.

(apply + [1 2 3])

Applies a function to each item in a collection.

(map inc [0 1 2])

Reduces a collection to a single value, using a function.

(reduce + [1 2 3])

Returns a sequence of items in a collection that satisfy a predicate.

(filter even? [1 2 3 4])

Logical AND of all arguments.

(and true false)

Logical OR of all arguments.

(or true false)

Logical NOT of an argument.

(not false)

Defines a new structure (deprecated in favor of records).

(defstruct point :x :y)

Creates a new structure instance (deprecated in favor of records).

(struct point 1 2)

Declares a namespace.

(ns my.namespace)

Includes a namespace.

(require '[clojure.string :as str])

Imports Java classes.

(import '[java.util Date])

Defines a var once; does not redefine if the var already exists.

(defonce x 10)

This list is

not exhaustive but includes some of the key constructs that form the foundation of programming in Clojure. Many of these special forms and macros facilitate the language's emphasis on immutable data structures, functional programming, and its Lisp heritage, allowing for powerful abstraction and concise code.

This formatted list is designed for a wiki page focusing on Clojure programming, providing newcomers with quick insights into essential language features along with examples to kickstart their learning journey.

“Like any programming language, the Clojure language designates certain words that the Clojure compiler / Clojure interpreter / Clojure REPL recognizes as special words. For that reason, you're not allowed to use them for naming your Clojure constructs. The list of reserved words (also called keywords) is surprisingly short:

Clojure Research:

• Clojure keywords on O'Reilly
• Clojure keywords on DuckDuckGo
• Clojure keywords on javatpoint.com
• Clojure keywords on w3schools.com
• Clojure keywords on tutorialspoint.com
• Clojure keywords on FreeCodeCamp.org
• Clojure keywords on IBM.com
• Clojure keywords on docs.microsoft.com
• Clojure keywords on whatis.techtarget.com
• Clojure keywords on YouTube
• Clojure keywords on GitHub
• Clojure keywords on Reddit
• Clojure keywords on scholar.google.com
• Clojure keywords on Quora
• Clojure keywords on DZone
• Clojure keywords on Hacker Noon
• Clojure keywords on StackOverflow

Fair Use Sources:

• Clojure keywords on DuckDuckGo