react-orchestra
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A toolbox to build interactive and smart instruments on the web and mobile.
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<h1 class="page-title">Source: helpers/getScalesFromNoteNames.js</h1>
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<pre class="prettyprint source linenums"><code>/* mod */
import SCALES from '../constants/SCALES';
import getUniqueNoteNamesNoOctave from './getUniqueNoteNamesNoOctave';
import getIntervalPermutationsFromNoteNames from './getIntervalPermutationsFromNoteNames';
/**
* getScalesFromNoteNames - Get all scales matched with the given notes
*
* @param {array} noteNames noteNames with octave
* @returns {array} Array of note names with octave
* [{firstNoteName: string, intervals: number, guessedScales: array}]
* @example
* getScalesFromNoteNames(['A3', 'B3', 'C3']);
* // [
* // {
* // firstNoteName: 'A',
* // intervals: [0, 9, 10],
* // guessedScales: ['dorian', 'mixolydian', 'acoustic', 'algerian', 'majorBlues']
* // },
* // {
* // firstNoteName: 'B',
* // intervals: [0, 2, 11],
* // guessedScales: ['ionian', 'lydian', 'harmonicMinor', 'melodicMinorAsc']
* // },
* // {
* // firstNoteName: 'C',
* // intervals: [0, 1, 3],
* // guessedScales: ['phrygian', 'locrian', 'altered']
* // },
* // ]
*/
const getScalesFromNoteNames = (noteNames) => {
const uniqueNoteNames = getUniqueNoteNamesNoOctave(noteNames);
const sequencePermutations = getIntervalPermutationsFromNoteNames(uniqueNoteNames);
Object.keys(SCALES).forEach((scaleName) => {
const scaleSequence = SCALES[scaleName].sequence;
if (scaleName === 'chromatic') {
return;
}
sequencePermutations.forEach((sequencePermutation, i) => {
const isInScaleSequence = sequencePermutation.intervals.reduce((prev, current) => {
if (prev === false) {
return false;
}
return scaleSequence.indexOf(current) !== -1;
}, true);
if (isInScaleSequence) {
sequencePermutations[i].guessedScales.push(scaleName);
}
});
});
return sequencePermutations;
};
export default getScalesFromNoteNames;
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<h2><a href="index.html">Home</a></h2><h3>Classes</h3><ul><li><a href="Instrument.html">Instrument</a></li><li><a href="Note.html">Note</a></li></ul><h3>Global</h3><ul><li><a href="global.html#addOctaveToNoteName">addOctaveToNoteName</a></li><li><a href="global.html#getInterval">getInterval</a></li><li><a href="global.html#getIntervalPermutationsFromNoteNames">getIntervalPermutationsFromNoteNames</a></li><li><a href="global.html#getJSONFromMidiURL">getJSONFromMidiURL</a></li><li><a href="global.html#getNoteNamesFromChordName">getNoteNamesFromChordName</a></li><li><a href="global.html#getNoteNamesFromIntervals">getNoteNamesFromIntervals</a></li><li><a href="global.html#getScaleNotes">getScaleNotes</a></li><li><a href="global.html#getScalesFromNoteNames">getScalesFromNoteNames</a></li><li><a href="global.html#getTracksAndMetaFromParsedMidi">getTracksAndMetaFromParsedMidi</a></li><li><a href="global.html#getTracksAndMetaFromUrl">getTracksAndMetaFromUrl</a></li><li><a href="global.html#getUniqueNoteNames">getUniqueNoteNames</a></li><li><a href="global.html#getUniqueNoteNamesNoOctave">getUniqueNoteNamesNoOctave</a></li><li><a href="global.html#isInHigherOctave">isInHigherOctave</a></li><li><a href="global.html#removeOctaveFromNoteName">removeOctaveFromNoteName</a></li><li><a href="global.html#reOrderNotes">reOrderNotes</a></li><li><a href="global.html#updateTempo">updateTempo</a></li></ul>
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Documentation generated by <a href="https://github.com/jsdoc3/jsdoc">JSDoc 3.4.3</a> on Sun Nov 20 2016 16:43:09 GMT+0200 (EET)
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