Music21j Class: ProtoM21Object

Class: ProtoM21Object

music21 .prebase. ProtoM21Object

new ProtoM21Object()

Class for pseudo-m21 objects to inherit from. The most important attributes that nearly
everything in music21 should inherit from are given below.

Properties:

Name	Type	Description
`classes`	Array.<string>	An Array of strings of classes that the object belongs to (default ['ProtoM21Object'])
`isProtoM21Object`	Boolean	Does this object descend from `music21.prebase.ProtoM21Object`: obviously true.
`isMusic21Object`	Boolean	Does this object descend from `music21.base.Music21Object`; default false.

Source:

music21/prebase.js, line 16

Methods

<static> ProtoM21Object#clone() → {Object}

Makes (as much as possible) a complete duplicate copy of the object called with .clone()

Works similarly to Python's copy.deepcopy().

Every ProtoM21Object has a ._cloneCallbacks object which maps {attribute: callbackFunction}
to handle custom clone cases. See, for instance, music21.base.Music21Object which
uses a custom callback to NOT clone the .activeSite attribute.

Source:

music21/prebase.js, line 76

Returns:

Type: object

Example

var n1 = new music21.note.Note("C#");
n1.duration.quarterLength = 4;
var n2 = n1.clone();
n2.duration.quarterLength == 4; // true
n2 === n1; // false

<static> ProtoM21Object#isClassOrSubclass(testClass) → {Boolean}

Check to see if an object is of this class or subclass.

Parameters:

Name	Type	Description
`testClass`	string \| Array.<string>	a class or Array of classes to test

Source:

music21/prebase.js, line 143

Returns:

Type: Boolean

Example

var n = new music21.note.Note();
n.isClassOrSubclass('Note'); // true
n.isClassOrSubclass('Music21Object'); // true
n.isClassOrSubclass(['Duration', 'NotRest']); // true // NotRest