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Crystal: Fast and Statically Typed

Crystal is a programming language that combines the performance of a compiled language with the safety and expressiveness of a high-level language. It is an object-oriented language with a syntax similar to Ruby, but with the added benefit of static typing. In this article, we will explore the key features of Crystal that make it a popular choice for developers who prioritize speed and type safety in their projects.

High Performance

One of the main reasons why developers choose Crystal is its impressive performance. Crystal achieves this by compiling the code to native machine code, which allows it to run significantly faster than interpreted languages like Ruby. Additionally, Crystal is built on the LLVM infrastructure, enabling it to take full advantage of the optimizations provided by the LLVM compiler. This combination of ahead-of-time compilation and LLVM optimization results in highly efficient and performant code.

Static Typing

Static typing is a feature that requires variables to have a specific type assigned to them at compile-time. Unlike dynamically typed languages, such as Ruby, where variables can change their types during runtime, Crystal enforces type safety at compile-time. This means that potential type-related errors are caught early in the development process, reducing the likelihood of runtime errors and improving overall code reliability.

Crystal’s static typing is achieved through a type inference system that automatically deduces the types of variables based on their usage. This eliminates the need for explicit type annotations in most cases, making the code concise and readable. However, Crystal also allows developers to specify types explicitly when necessary, giving them fine-grained control over the type system.

Expressive Syntax

Crystal’s syntax is heavily influenced by Ruby, which is known for its simplicity and readability. This makes Crystal an excellent choice for developers who are familiar with Ruby or appreciate its elegant and expressive syntax. Crystal’s syntax also includes features from other languages, such as C and Python, making it a versatile language that can handle a wide range of programming tasks.

Concurrency and Parallelism

Crystal provides built-in support for lightweight concurrency through fibers, which are similar to threads but more lightweight and efficient. Fibers allow developers to write concurrent code without the overhead typically associated with traditional threads. Additionally, Crystal has a built-in parallel iterator that enables easy parallelization of computations, further enhancing performance in multi-core systems.


Crystal is designed to be compatible with C, allowing developers to seamlessly integrate existing C libraries into their Crystal projects. This interoperability opens up a vast ecosystem of well-established libraries and tools that can be utilized alongside Crystal. Additionally, Crystal can also generate bindings for C++ libraries, further expanding its compatibility and usability.


Crystal offers a compelling combination of speed, static typing, and expressive syntax, making it an attractive choice for developers seeking a high-performance language with strong type safety. Its ability to compile to native machine code and take advantage of LLVM optimizations ensures that Crystal code runs efficiently. The static typing system catches potential errors early, leading to more reliable and robust code. The expressive syntax, influenced by Ruby, allows for concise and readable code, while the built-in support for concurrency and parallelism enables efficient utilization of modern hardware. With its interoperability with C and C++ libraries, Crystal provides access to a vast ecosystem of existing tools and libraries. Whether you are building a web application, a system-level program, or anything in between, Crystal is definitely worth considering for its speed and type safety.

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