def()
A JSFunction that defines a new method and adds it to a multimethod.
Usage
def(multimethod, signature, implementation)
def(multimethod, signature, implementation, callsNext)
Parameters
| # | Parameter | Required? | Type | Default |
|---|---|---|---|---|
| 1 | multimethod | yes | TGeneric.md | |
| 2 | signature | yes | JSArray<TAny> | |
| 3 | implementation | yes | JSFunction | |
| 4 | callsNext | no | JSBoolean | false |
1. multimethod
The multimethod for which a new method shall be defined.
2. signature
The new method's signature. It's an array containing zero or more items.
A signature item can be:
- A predicate function (function returning a
JSBoolean) - A
TType, for exampleJSStringorTNumber - A JavaScript class
- A trait
- A value
Return value
The JSFunction used to create the method (implementation). This reference
can be used to remove the method with undef().
Version History
| Feature | Since version |
|---|---|
| def() | 1.0 |
See also
- API: undef