How to use the music-gamut.operation function in music-gamut
To help you get started, we’ve selected a few music-gamut examples, based on popular ways it is used in public projects.
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tonaljs / tonal / packages / music-scale / lib / select.js View on Github 
module.exports = function select (pttn, notes) {
if (arguments.length === 2) return select(pttn)(notes)
return G.operation(function (g) {
var nums = G.split(pttn).map(function (n) { return +n - 1 })
var index = []
build(g, false).forEach(function (item) {
var fifths = (item[0] + 1) % 7
index[STEPS[fifths]] = item
})
var selected = nums.map(function (n) {
var i = index[n % 7]
// up an octave if number > 7
if (i && n > 6) {
i = i.slice()
i[1] = i[1] + Math.floor(n / 7)
}
return i
})
return selected.map(transpose(g[0]))
