lib/utils/sort-pitches.js
function sortPitches (pitches) {
  return pitches.map(Pitch).sort(function (a, b) {
    return a - b
  }).map(function (pitch) {
    return pitch.sciPitch()
  })
}
function sortPitches (pitches) {
  return pitches.map(Pitch).sort(function (a, b) {
    return a - b
  }).map(function (pitch) {
    return pitch.sciPitch()
  })
}
function sortPitches ( pitches ) { return pitches . map ( Pitch ) . sort ( function ( a , b ) { return a - b } ) . map ( function ( pitch ) { return pitch . sciPitch ( ) } ) }
helper function to sort an array of pitches from lowest to highest
@param {string[]} pitches - an array of pitch strings
@returns {string[]} a new clone of the provided pitch string
array sorted from low pitch to high pitch
helper function to sort an array of pitches from lowest to highest