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The Colon Operator (“:”) is a shorthand syntax used for calling methods on objects.

When you use the colon syntax to call a function, the object (the “self”) is automatically passed as the first parameter to the function.

For example… 

local Fruit = "Apple,Banana,Orange"
local List = string.split(Fruit, ",")
trace(List)

is equivalent to:

local Fruit = "Apple,Banana,Orange"
local List = Fruit:split(",")
trace(List)

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