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Racket's core language includes macros, modules, lexical closures, tail calls, delimited continuations, parameters (fluid variables), software contracts, green and OS threads, and more. The language also comes with primitives, such as event spaces 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. 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 insured to make contract checks when its methods are eventually invoked.

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.

Since 2004, the language has also shipped with PLaneT, a package manager that is integrated into the module system so that third-party libraries can be transparently imported and used. Additionally, PLaneT has a built-in versioning policy to prevent dependency hell.

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Basic example of Racket programming is as follows :


#lang racket
; data definitions

(define id? symbol?)
(define id-equal? eq?)
(define-struct basic-customer (id name address) #:mutable)

; interface
[id? (-> any/c boolean?)]
[id-equal? (-> id? id? boolean?)]
[struct basic-customer ((id id?)
(name string?)
(address string?))]))
; end of interface
This module contains the program that uses the above.

#lang racket

(require "1.rkt") ; the module just above

; implementation
; [listof (list basic-customer? secret-info)]
(define all '())

(define (find c)
(define (has-c-as-key p)
(id-equal? (basic-customer-id (car p)) c))
(define x (filter has-c-as-key all))
(if (pair? x) (car x) x))

(define (active? c)
(pair? (find c)))

(define not-active? (compose not active? basic-customer-id))

(define count 0)
(define (get-count) count)

(define (add c)
(set! all (cons (list c 'secret) all))
(set! count (+ count 1)))

(define (name id)
(define bc-with-id (find id))
(basic-customer-name (car bc-with-id)))

(define (set-name id name)
(define bc-with-id (find id))
(set-basic-customer-name! (car bc-with-id) name))

(define c0 0)
; end of implementation

; how many customers are in the db?
[get-count (-> natural-number/c)]
; is the customer with this id active?
[active? (-> id? boolean?)]
; what is the name of the customer with this id?
[name (-> (and/c id? active?) string?)]
; change the name of the customer with this id
[set-name (->i ([id id?] [nn string?])
[result any/c] ; result contract
#:post (id nn) (string=? (name id) nn))]

[add (->i ([bc (and/c basic-customer? not-active?)])
; A pre-post condition contract must use
; a side-effect to express this contract
; via post-conditions
#:pre () (set! c0 count)
[result any/c] ; result contract
#:post () (> count c0))]))
The tests:

#lang racket
(require rackunit rackunit/text-ui "1.rkt" "1b.rkt")

(add (make-basic-customer 'mf "matthias" "brookstone"))
(add (make-basic-customer 'rf "robby" "beverly hills park"))
(add (make-basic-customer 'fl "matthew" "pepper clouds town"))
(add (make-basic-customer 'sk "shriram" "i city"))

(test-equal? "id lookup" "matthias" (name 'mf))
(test-equal? "count" 4 (get-count))
(test-true "active?" (active? 'mf))
(test-false "active? 2" (active? 'kk))
(test-true "set name" (void? (set-name 'mf "matt")))))


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