test for creative

[hidden ibex]

You don't need javascript. You can execute a command on a player with target selector @a[m=creative]. If you want to always test for a creative player, just do /execute @a[m=creative] ~~~ (your command) in an .mcfunction file, then put that function file in tick.json

[turbid sundial]

And if you do need to use scripting, use world.getPlayers (https://learn.microsoft.com/en-us/minecraft/creator/scriptapi/mojang-minecraft/world#getplayers) with query options (https://learn.microsoft.com/en-us/minecraft/creator/scriptapi/mojang-minecraft/entityqueryoptions) specifying a creative gameMode (https://learn.microsoft.com/en-us/minecraft/creator/scriptapi/mojang-minecraft/gamemode) value.

To test an individual entity, just see if they’re in that list.