@typedin/music-utilities/dist/scale-builders/beginOn.js

A set of resources and modules I use to develop music applications.

import { DiatonicNoteEnum } from "../constants.js";
export function beginOn(scale, startingNote) {
    const indexOfFirstDegree = scale.findIndex((degree) => degree.name == startingNote.name);
    const firstPart = scale.slice(indexOfFirstDegree, scale.length);
    const secondPart = scale.slice(0, indexOfFirstDegree);
    const result = firstPart.concat(secondPart);
    let hasTheNoteB = false;
    result.forEach((degree, index) => {
        if (hasTheNoteB) {
            degree.octave = startingNote.octave + 1;
        }
        else {
            degree.octave = startingNote.octave;
        }
        if (degree.name == DiatonicNoteEnum.B) {
            hasTheNoteB = true;
        }
        degree.order = index + 1;
    });
    return result;
}
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