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docs(sequence): actor creation and destruction #1838

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Laura Valentine Tscharner
2023-06-08 17:44:36 +01:00
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docs/syntax/sequenceDiagram.md
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@@ -94,6 +94,43 @@ sequenceDiagram
J->>A: Great!
```
### Actor Creation and Destruction
It is possible to create and destroy actors by messages. To do so, add a create or destroy directive before the message.
create participant B
A --> B: Hello
Create directives support actor/participant distinction and aliases. The sender or the recipient of a message can be destroyed but only the recipient can be created.
```mermaid-example
sequenceDiagram
Alice->>Bob: Hello Bob, how are you ?
Bob->>Alice: Fine, thank you. And you?
create participant Carl
Alice->>Carl: Hi Carl!
create actor D as Donald
Carl->>D: Hi!
destroy Carl
Alice-xCarl: We are too many
destroy Bob
Bob->>Alice: I agree
```
```mermaid
sequenceDiagram
Alice->>Bob: Hello Bob, how are you ?
Bob->>Alice: Fine, thank you. And you?
create participant Carl
Alice->>Carl: Hi Carl!
create actor D as Donald
Carl->>D: Hi!
destroy Carl
Alice-xCarl: We are too many
destroy Bob
Bob->>Alice: I agree
```
### Grouping / Box
The actor(s) can be grouped in vertical boxes. You can define a color (if not, it will be transparent) and/or a descriptive label using the following notation: