> For the complete documentation index, see [llms.txt](https://chaoses-ib.gitbook.io/directory-opus/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://chaoses-ib.gitbook.io/directory-opus/manual/reference/evaluator/isset.md).

# IsSet

\<evalcmd> IsSet && bool && **True** if all specified variables exist. && name && var && Name of variable to test for. && \[name...] && var && Additional variable names... \</evalcmd>

Returns **True** if all specified variables exist (within the context of this evaluation). Returns **False** if any do not exist.

//<Example://>

```
if (IsSet("j")) { ... } // does a variable called "j" exist?
if (IsSet("name", "ext")) { ... } // do variables called "name" and "ext" both exist?
```

*See also:* [val](/directory-opus/manual/reference/evaluator/val.md)