Create all modal scales from the same pattern

createScales.js

const halfStepPattern = [2, 2, 1, 2, 2, 2, 1]
const modes = ["Ionian", "Dorian", "Phrygian", "Lydian", "Mixolydian", "Aeolian", "Locrian"]
const notes = ["C", "C#", "D", "D#", "E", "F", "F#", "G", "G#", "A", "A#", "B"]

const notesDoubled = notes.concat(notes) // double the array to get a cheap "ring buffer"
const patternDoubled = halfStepPattern.concat(halfStepPattern)

notes.forEach((note, noteIndex) => {
  modes.forEach((mode, modeIndex) => {
    let currentStep = 0
    const scaleNotes = []
    for (let stepIndex = 0; stepIndex < halfStepPattern.length; stepIndex++) {
      scaleNotes.push(notesDoubled[noteIndex + currentStep])
      currentStep += patternDoubled[modeIndex + stepIndex]
    }
    console.log(`${note} ${mode}: ${scaleNotes.join(', ')}`)
  })
})