| Name | <InventoryTag.first_empty> |
| Returns | ElementTag(Number) |
| Description | Returns the location of the first empty slot.
Returns -1 if the inventory is full. |
| Generated Example | |
| Source | https://github.com/DenizenScript/Denizen/blob/dev/plugin/src/main/java/com/denizenscript/denizen/objects/InventoryTag.java#L1851 |