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@tonaljs/interval

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Readme

@tonaljs/interval

A collection of functions to create and manipulate music intervals

API

`names() => string[]`

Return a list of (natural) interval names:

names(); // => ["1P", "2M", "3M", "4P", "5P", "6m", "7m"]

`fromSemitones(semitones: number) => string`

Given a number of semitones, returns the interval name:

fromSemitones(7); // => "5P"
fromSemitones(-7); // => "-5P"

`simplify(interval: string) => string`

Simplify an interval:

simplify("9M"); // => "2M"
["8P", "9M", "10M", "11P", "12P", "13M", "14M", "15P"].map(simplify);
// => [ "8P", "2M", "3M", "4P", "5P", "6M", "7M", "8P" ]
simplify("2M"); // => "2M"
simplify("-2M"); // => "7m"

`invert(interval: string) => string`

Get the interval inversion:

invert("3m"); // => "6M"
invert("2M"); // => "7m"

`add(a: string, b: string) => string`

Add two intervals:

add("3m", "5P"); // => "7m"

`substract(min: string, sub: string) => string`

Substract two intervals:

substract("5P", "3M"); // => '3m'
substract("3M", "5P"); // => '-3m'