Polca ("polish notation calculator") is an interactive programming environment and language. The polca language is functional and stack-based. While the most basic syntax seems to have stabilized, many of the built-in functions have not. Do not expect them to be unchanging.
If you are familiar with reverse polish notation (aka postfix notation), you can use polca as a caluclator immediately.
1 2 + leaves you with a 3 on the stack. Think of it like this: "there is a 1, than there is a 2, then add". In this case add means that you take the two topmost things off the stack, then add them, then put the result back ontro the stack. This looks unusual at first, but it's very powerful. In polca, "+" is just a function. You just write functions in the order they are applied in. And you can write your own functions and use them just like the others!
Here is some other basic math functions you may want to play around with: - subtraction, _ negation, * multiplication, / division, % modulo, ^ exponentiation. Oh, and =, > and < are just functions, too! Polca uses "0" and "1" as truth values.
To define a function, you can just write it in parentheses, like this: (3 *). They can take any number of values as inputs and outputs.
Functions are evaluated with !, but that is mostly useful within other functions.
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Check out
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npm install -
npm run watchto run the typescript watcher, compiling the ts files -
The development version can be found in the
distfolder
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npm test -
npm run coverageto see code coverage of these tests