Clojure.core

As explained in Clojure: The Essential Reference

clojure.core is the Clojure namespace containing the language's principal public functions, macros, operators, and conditionals.

clojure.core is Clojure’s principal public namespace: it supplies basic math operators, function-building functions, conditionals, and many other language APIs. Its definitions are available without explicitly referencing a namespace. section 1.4

Use clojure.core as the default foundation for Clojure programs:

• It contains roughly 700 function and macro definitions. section 1.4
• It includes operators, conditionals, and functions for creating and manipulating functions. section 1.4
• Other standard namespaces, such as clojure.string, clojure.test, and clojure.zippers, may require qualification or require. section 1.4
• Definitions marked alpha are usable but subject to change. section 1.4

Figure 1.2. All other non-core namespaces.

Compare clojure.core with the other non-core namespaces shipped in the standard library. section 1.4

How Clojure: The Essential Reference covers it

How deep it goes

Defines core’s scope and availability, but stops short of explaining individual functions, macros, contracts, or edge cases.

Examples

Uses clojure.string/upper-case, clojure.test, and clojure.zippers as examples of non-core namespace organization.

What it assumes

Assumes familiarity with Clojure namespaces while introducing the distinction between core, other standard namespaces, and Java interoperability.

What you can do after

Evaluate/understand which APIs are implicitly available and when other standard namespaces need qualification or requiring.

How it connects

Connects core with namespaces, standard-library organization, Java interoperability, persistent collections, concurrency, and software transactional memory.

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Related concepts

• dynamic bindingused by · A dynamic binding is a value associated with a var for a specific thread, allowing different threads to observe different values.
• standard librarypart of · A standard library is a collection of reusable modules, types, functions, APIs, and other facilities distributed with a programming language implementation or platform.
• set!uses · set! is a Clojure mutation construct that assigns a value to a mutable target such as a field or thread-local binding.

This explainer was generated by Manning's knowledge graph from the text of Clojure: The Essential Reference. The section links point to the parts of the book it draws on.