Elixir - A brief introduction to the language behind WhatsApp, Nubank, Brex, and so many others!

The article discusses the Elixir programming language and its usefulness in building scalable and resilient systems. Elixir is a functional programming language that allows for better use of multi-core CPUs and writing shorter, more explicit code. The fundamental principles of functional programming include immutability, functions, and declarative code, which simplify parallel work and provide an alternative to conventional programming languages. Elixir's syntax is similar to Ruby's and is widely used to build fault-tolerant, scalable, and maintainable applications. The language provides a solid set of web development tools, including Mix, IEx, and Phoenix, which is known for being one of the best web frameworks. Elixir is fundamental for building systems that operate in a distributed manner and is a great choice for developing microservices. Companies such as Nubank and Brex have used Elixir in their systems, with Nubank's tech manager stating that the immutable paradigm helps in the company's internationalization process. Elixir has a range of features, including primitive types, modules, and functions, as well as pattern matching, which allows for the association of expressions and the creation of multiple clauses for functions. The language also has a range of libraries and frameworks that make it easy to build and deploy applications. Overall, Elixir is a powerful and flexible language that is well-suited for building complex systems and applications. The article also notes that while Brex initially used Elixir, it has since switched to Kotlin, but still acknowledges the importance of Elixir in its early stages.