@tonaljs/scale-type 


@tonaljs/scale-type is a dictionary of musical scales.

Usage

ES6:

``js
import { ScaleType } from "tonal";
`

nodejs:

`js
const { ScaleType } = require("tonal");
`

API

#### get(name: string) => ScaleType

Given a scale type name, return a ScaleType object with the following properties:

- name: the scale type name
- aliases: a list of alternative names
- quality: Major | Minor | Augmented | Diminished | Unknown
- num: the pcset number
- chroma: the pcset chroma
- length: the number of notes
- intervals: the interval list

Example:

`js
ScaleType.get("major"); // =>
// {
// name: "major",
// aliases: ["ionian"],
// num: 2773,
// chroma: "101011010101",
// length: 7
// intervals: ["1P", "2M", "3M", "4P", "5P", "6M", "7M"],
// });
`

#### names() => string[]

Return a list of all scale names

#### all() => object[]

Return a list of all scale types

#### add(intervals: string[], name?: string, aliases?: string[]) => ScaleType

Add a scale type to dictionary:

`js
ScaleType.add(["1P", "5P"], null, ["5"]);
`

HOW TO

#### How to get all pentatonics names?

`js
ScaleType.all()
.filter((scaleType) => scaleType.intervals.length === 5)
.map((scaleType) => scaleType.name);
`

#### How do to add a scale to the dictionary?

`js
ScaleType.add(["1P", "5P"], "quinta", ["quinta justa", "diapente"]);
ScaleType.scale("quinta"); // => { name: "quinta", intervals: ...}
ScaleType.scale("quinta justa"); // => { name: "quinta", intervals: ... }
``

#### References

Some sources explaining various scale systems:

- Modes>)
- Blues Scales
- Jazz Scales
- Messiaen's "Modes of Limited Transposition" (wikipedia, en)
- Raga