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test tonal methods + move mod to util

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This commit is contained in:
Felix Roos 2022-02-28 22:52:09 +01:00
parent 020c1d5589
commit df21c81bfa
5 changed files with 129 additions and 54 deletions
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24
util.mjs
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@ -1,11 +1,17 @@
// returns true if the given string is a note
export const isNote = (name) => /^[a-gA-G][#b]*[0-9]$/.test(name);
export const tokenizeNote = (note) =>
typeof note === 'string'
? note
.match(/^([a-gA-G])([#b]*)([0-9])?$/)
?.slice(1)
?.map((x) => (x === undefined ? '' : x)) || []
: [];
export const tokenizeNote = (note) => {
if (typeof note !== 'string') {
return [];
}
const [pc, acc = '', oct] = note.match(/^([a-gA-G])([#b]*)([0-9])?$/)?.slice(1) || [];
if (!pc) {
return [];
}
return [pc, acc, oct ? Number(oct) : undefined];
};
// turns the given note into its midi number representation
export const toMidi = (note) => {
const [pc, acc, oct] = tokenizeNote(note);
if (!pc) {
@ -18,3 +24,7 @@ export const toMidi = (note) => {
export const fromMidi = (n) => {
return Math.pow(2, (n - 69) / 12) * 440;
};
// modulo that works with negative numbers e.g. mod(-1, 3) = 2
// const mod = (n: number, m: number): number => (n < 0 ? mod(n + m, m) : n % m);
export const mod = (n, m) => (n < 0 ? mod(n + m, m) : n % m);