Software Update: Racket 8.1

Racket is a development language with which other development languages ​​can be developed. In addition, you can simply develop in Racket itself. It was previously known as the PLT Scheme and comes from the Lisp-Scheme family. For the background we refer to the manifesto, written under the direction of Matthias Felleisen. The developers have released version 8.1 of Racket, with the following announcement:

Changes in Racket version 8.1:

• DrRacket tabs can be dragged, and have new close buttons.
• Racket CS supports cross-compilation using raco exe.
• Racket CS supports Android on 32-bit and 64-bit ARM processors.
• The database library supports running queries in OS threads.
• Check-Syntax arrows correctly identify the definition site of identifiers with contracts.
• Racket CS performance has improved for structure predicates and accessors
• Racket CS is faster at multiplying extremely large numbers and dividing large integers.
• Racket CS allows callbacks to raise exceptions if they are annotated with #:callback-exns?.
• New ephemeron hash tables simplify the implementation of tables where keys can refer to values.
• Typed Racket supports for/foldr.
• The stepper works for #lang htdp/*sl.
• Struct signatures work for the ASL teaching language.