Checking to see if pixel index is in array

Patterns and Code
1

For one of my patterns I’m trying to colour items based on arrays of pixels within the project.
I’ve used array literals to identify the grouping of pixels, but I need to use those groupings to ensure that each array each has the same colour at a given time.
As pixel blaze doesn’t have the array.includes() function, what is the best method to check to see if the pixel is in a given array when I pick the render colour?

Example of arrays

F_T_R = [0,1,2,9,10,11,18,19,20]
F_T_M = [9,10,11,12,13,14,15,16,17]
F_T_L = [18,19,20,21,22,23,24,25,26]
2

The fastest would be to have an array with group ids as the values. This way you can get the group with a single lookup based on the pixel. Eg

group = pixelGroups[index]

Then set color based on the group.

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