2022-08-01 05:32:47 +00:00
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# Tutorial: calc
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2022-08-02 03:36:17 +00:00
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{{#include caveat.md}}
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2022-08-01 05:32:47 +00:00
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This tutorial walks through an end-to-end example of using Salsa.
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It does not assume you know anything about salsa,
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but reading the [overview](./overview.md) first is probably a good idea to get familiar with the basic concepts.
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Our goal is define a compiler/interpreter for a simple language called `calc`.
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The `calc` compiler takes programs like the following and then parses and executes them:
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```
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fn area_rectangle(w, h) = w * h
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fn area_circle(r) = 3.14 * r * r
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print area_rectangle(3, 4)
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print area_circle(1)
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print 11 * 2
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```
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When executed, this program prints `12`, `3.14`, and `22`.
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If the program contains errors (e.g., a reference to an undefined function), it prints those out too.
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And, of course, it will be reactive, so small changes to the input don't require recompiling (or rexecuting, necessarily) the entire thing.
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