Last updated: 29th May 2020 (corrections). See also: discussion on Hacker News.
6 Reasons to Use Nim
Nim is a programming language that has a syntax similar to Python but is compiled to binary code.
See also: Nim Books
1. Friendly Syntax
Nim has a syntax that is similar to Python.
2. High Performance
Nim is much faster than Python (not when comparing C libraries wrapped for Python of course). Nim code compiles first to C then to binaries, with C-like performance always a possibility.
3. Statically Typing
Nim has a statically typed system, unlike Python where types can only be specified optionally. A statically typed language gives better information to the compiler for better optimizations.
4. Managed Memory
Memory leaks are not a concern as Nim uses one of several available garbage collectors. The new ARC option works with reference counting instead of a GC.
5. Package Manager
Nimble is a package manager which makes installing Nim libraries easy.
6. Version 1.0 Milestone
Nim has seen low levels of adoption, but this may be due to version 1.0 taking a long time to be released. Now released in September 2019 Nim has a good foundation for applications and libraries to build on.
See also: Nim Books
4 Disadvantages of using Nim
1. Small Community
Nim has a small following, which means few jobs are available, and the libraries and frameworks for Nim are lacking. C, C++ and Python libraries can be utilized, however, helping to bridge the gap.
2. Better concurrency/parallelism support needed
Nim supports threads, channels and async. However in general concurrency/parallelism needs more work.
Related article: an overview of the current state of Nim’s concurrency/parallelism features.
3. Unhelpful error messages
The Nim compiler often gives unhelpful error messages.
4. Web Frameworks are Lacking
Many languages became popular due to well developed web frameworks (e.g. Ruby has Rails, Elixir has Phoenix and Crystal has Amber, Lucky and others). Nim has Jester which still needs further development and documentation. There is also Karax which is a SPA web framework.