What new web development languages are emerging?

New web development languages emerging include Elm, Rust, Elixir, Julia, and Crystal.

Elm is a functional programming language that compiles to JavaScript. It is gaining popularity due to its simplicity and robustness. Elm's architecture is designed to make web development more predictable and less error-prone. It has a strong type system that prevents runtime errors and a friendly compiler that provides useful error messages.

Rust is another emerging language that is designed for performance and safety, particularly safe concurrency. It is syntactically similar to C++, but its designers intend it to provide better memory safety while maintaining high performance. Rust is being adopted by some major tech companies like Mozilla and Dropbox for its efficiency and robustness.

Elixir is a dynamic, functional language designed for building scalable and maintainable applications. It leverages the Erlang VM, known for running low-latency, distributed, and fault-tolerant systems. Elixir is used by companies such as Pinterest and Moz for its ability to handle large volumes of data and users.

Julia is a high-level, high-performance dynamic programming language for technical computing, with syntax that is familiar to users of other technical computing environments. It provides a sophisticated compiler, distributed parallel execution, numerical accuracy, and an extensive mathematical function library. Julia's base library integrates mature, best-of-breed open source C and Fortran libraries for linear algebra, random number generation, signal processing, and string processing.

Crystal is a statically typed, compiled language with Ruby-like syntax. It is designed to be easy to read and write, yet also very efficient. Crystal compiles to efficient native code, which makes it a good choice for high-performance web applications.

These languages are still relatively new and not as widely used as more established languages like JavaScript, Python, or Ruby. However, they offer unique features and advantages that make them worth considering for future web development projects. As the field of web development continues to evolve, it's important to keep an eye on emerging languages and technologies.