About koto-calc

koto-calc is an interactive calculator with a REPL, built in Rust. It runs the Koto language and extends it with an Algebraeon module for exact arithmetic and symbolic computation.

print 'Hello, World!'

square = |n| n * n
print! '8 squared is {square 8}'
check! 8 squared is 64

koto-calc is a fork of the Koto CLI, focused on mathematical computing. The Koto language was created in 2020 as an embeddable scripting language for Rust applications; koto-calc inherits its syntax and runtime while adding algebraic types.

Features

• Koto language — Simple, expressive syntax with fast compilation and a rich iterator model. See the language guide for details.
• Exact algebra — Arbitrary-precision integers, rationals, algebraic numbers, polynomials, matrices, quaternions, finite fields, group theory, and more via the algebraeon module.
• REPL — Interactive read-eval-print loop with syntax highlighting, tab completion, and the help command for built-in documentation.
• Tests in the language — First-class test support: @test functions, assert statements, and the --tests / --import_tests flags.
• Scripting — Run .koto scripts with arguments accessible via os.args.

Current State

koto-calc is in early development. The Koto language itself is maturing but has not yet reached 1.0. Early adopter feedback is welcome.

Attribution

koto-calc is built on Koto (MIT license), originally designed as an extension language for Rust applications. The core language, runtime, standard library modules, and library modules (color, geometry, json, random, regex, tempfile, toml, yaml) are derived from Koto.

The algebraeon module and the calculator orientation are koto-calc additions.