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How to read Variables and Functions
Format Use Example Info

var x = event.variableName

event.variableName = 10

A simple variable, can be read and changed as well
functionName() event.functionName() Function with no parameters, can be called
functionName(int x, String y)

event.functionName(10, 'abc')

Function with parameters with types specified (even if JS doesn't have function types), can be called
variableName var x = event.variableName Variable that can only be read but can't be changed
variableName event.variableName = 10 Variable that can only be changed, but can't be read