pitch

pitch is a collection of tools for working with musical pitch. It is implemented in TypeScript for Deno.

spn.ts

In Scientific Pitch Notation (SPN) a musical pitch is specified by combining a musical note name (with accidental if needed) and a number identifying the pitch’s octave. For example, A4, C#4, and Eb2 are valid pitches in SPN. Such strings can be parsed with the parse function:

import { parse } from "https://deno.land/x/pitch/spn.ts";

const { letter, accidental, octave } = parse("C#4");
console.assert(letter === "C");
console.assert(accidental === "#");
console.assert(octave === 4);

Given a Letter, Accidental, and octave number, the stringify function generates an SPN string:

import { stringify } from "https://deno.land/x/pitch/spn.ts";

const spn = stringify({
  letter: "C",
  accidental: "#",
  octave: 4,
});

console.assert(spn === "C#4");