In computer software programming languages, Crystal is a general-purpose, object-oriented programming language, designed and developed by Ary Borenszweig and Juan Wajnerman and more than 200 contributors. With syntax inspired by the language Ruby, it is a compiled language with static type-checking, but specifying the types of variables or method arguments is generally unneeded. Types are resolved by an advanced global type inference algorithm. Crystal is in active development. It is released as free and open-source software under the Apache License version 2.0


Work on the language began in June 2011, with the purpose of creating a language with the elegance and productivity of Ruby and the speed, efficiency, and type safety of a compiled language. Initially named Joy, it was quickly renamed to Crystal.

The Crystal compiler was first written in Ruby, but later rewritten in Crystal, thus becoming self-hosting, as of November 2013. The first official version was released in June 2014. In July 2016, Crystal joined the TIOBE index.


Although resembling the Ruby language in syntax, Crystal compiles to much more efficient native code using an LLVM backend, at the cost of precluding the dynamic aspects of Ruby. However, the advanced global type inference used by the Crystal compiler, combined with the use of union types, gives Crystal the feel of a higher-level scripting language more so than many other comparable programming languages. The language has automated garbage collection and currently offers a Boehm collector. Crystal possesses a macro system and supports generics, and method and operator overloading. Crystal’s concurrency model is inspired by communicating sequential processes (CSP) and implements light-weight fibers and channels (for communicating between fibers) inspired by the language Go.

Source: Wikipedia

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