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Teko is a programming language of an unusual sort - a statically typed scripting language. The plan is for Teko to be both interpreted and compiled, à la Python; its interpretation-oriented organization and built-in types and data structures give it the ease of use of a scripting language like JS, Python, or Ruby, while its static typing and "functional-by-default" semantics will provide better safety and scalability.

Major design features include:

  • Static typing
  • The freedom of organization of a scripting language - put variable declarations, control blocks, or whatever you want right in the body of a file, no need to wrap it in a class or main()!
  • Zero type coercion - made up for with a variety of lightweight conversion syntax (5$ means 5.to_str())
  • Everything is a method: e.g., + is always an alias for .add(); 3 + 4 is (3).add(4)
  • Everything is an expression - assignments and control blocks evaluate to a value
  • Out of the box data structures, including dynamic arrays, sets, maps, and algebraic data types
  • Elements of functional or functional-by-default style programming:
    • First-order functions and closures
    • Fastidiousness about mutability - mutable variables must be declared with the var keyword
    • Type inference - type may be omitted from declarations
    • Lightweight currying with ellipsis .. syntax
  • Purely structural types
    • Objects can be created without a constructor, by simply listing all members
    • Class constructors are just syntactic sugar and you often don't need them - they're actually just functions!


  1. Make sure you have the Go programming language installed.

  2. Clone this repo and cd into it.

From here your road diverges in a yellow wood:

Using go install

  1. Make sure go install works as expected. If you're not sure how to do that, try adding export PATH=$PATH:$(go env GOPATH)/bin to your .bashrc or something similar.

  2. Run go install

  3. Try running teko tests/ Hopefully you don't get something that looks like

Command 'teko' not found, did you mean:

If you do, revisit step 3.

Manually moving executable to PATH

  1. Run go build

  2. Move the newly created teko executable into any directory in your PATH

  3. Try running teko tests/ Hopefully you don't get something that looks like

Command 'teko' not found, did you mean:

If you do, revisit step 4.

Running executable from working directory

  1. Run go build

  2. Try running ./teko tests/ If something doesn't look right, that's on us.


I want to thank @iafisher, @Pierre-vh, @goldfirere, and @lwpulsifer for their assistance so far in thinking through the design and implementation of Teko.


Teko is a statically typed, multi-paradigm scripting language.



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