Major & Minor Scales

Scales

A scale is an ordered set of notes within an octave, defined by intervals between consecutive notes.

Major Scale (Ionian Mode)

The major scale has a bright, happy character. Intervals in semitones:

W W H W W W H
2 2 1 2 2 2 1

(W = whole step = 2 semitones, H = half step = 1 semitone)

Starting from MIDI root: add [0, 2, 4, 5, 7, 9, 11, 12] semitones.

Natural Minor Scale (Aeolian Mode)

The natural minor scale sounds darker and more melancholic:

W H W W H W W
2 1 2 2 1 2 2

Intervals from root: [0, 2, 3, 5, 7, 8, 10, 12]

Example: C Major

MIDI: 60, 62, 64, 65, 67, 69, 71, 72
Note:  C4  D4  E4  F4  G4  A4  B4  C5

Example: A Minor

MIDI: 69, 71, 72, 74, 76, 77, 79, 81
Note:  A4  B4  C5  D5  E5  F5  G5  A5

Your Task

Implement scaleNotes(root, isMinor) that returns an array of 8 MIDI note numbers.

Run your code to hear a major scale ascend.