A Musi file ends in .ms. Start with one file and one check command. This keeps the first step small.
let total := 42;
total;This example gives a name to one value. The word after let is the name. The text after := is the value the name holds.
You can think of let total := 42; like writing a label on a jar. The label is total. The thing inside is 42.
Run a check command after you write a file. A check is like asking, "Does this note make sense?" It catches missing names, wrong types, and syntax that Musi cannot read.
File shape
A small Musi file can be only names and expressions.
let host := "localhost";
let port := 8080;
port;Each let gives a name to a value. The last expression is the value the file leaves for the checker or caller.
First checks
Start with one file and one command. Fix syntax errors before adding more code. Fix type errors before adding more files.
When an error names a line, read that line first, then read the line above it. Missing ;, ), ], or } often makes the next line look wrong.