Racket Online Help

Racket is a full-spectrum programming language. It goes beyond Lisp and Scheme with dialects that support objects, types, laziness, and more. Racket enables programmers to link components written in different dialects, and it empowers programmers to create new, project-specific dialects. Racket's libraries support applications from web servers and databases to GUIs and charts.

Racket's compiler is a bytecode compiler that translates to an internal bytecode format that is run by the Racket virtual machine. On x86 and PowerPC platforms, the bytecode is further compiled using a JIT compiler at runtime.

The platform provides an implementation of the Racket language (including a sophisticated run-time system, various libraries, JIT compiler, and more) along with a development environment called DrRacket (formerly named DrScheme) written in Racket itself. The IDE and an accompanying programming curriculum is used in the ProgramByDesign outreach program, an attempt to turn computing and programming into "an indispensable part of the liberal arts curriculum". The core language is known for its extensive macro system which enables the creation of embedded and domain-specific languages, language constructs such as classes or modules, and separate dialects of Racket with different semantics.

Racket's core language includes macros, modules, lexical closures, tail calls, delimited continuations, parameters (fluid variables), software contracts, green and OSthreads, and more. The language also comes with primitives, such as eventspaces and custodians, which control resource management and enables the language to act like an operating system for loading and managing other programs. Further extensions to the language are created with the powerful macro system, which together with the module system and custom parsers can control all aspects of a language. Unlike programming languages that lack macro systems, most language constructs in Racket are written on top of the base language using macros. These include a mixin class system, a component (or module) system as expressive as ML's, and pattern matching.

In addition, the language features the first contract system for a higher-order language.[34] Racket's contract system is inspired by the Design by Contract work for Eiffel and extends it to work for higher-order values such as first-class functions, objects, reference cells, and so on. For example, an object that is checked by a contract can be ensured to make contract checks when its methods are eventually invoked.

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