Explanations on sample()

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I don’t understand how to use samples in LUA.

The SDK documentation says:

Suspect some code is running hot? Wrap it in an anonymous function and pass it to sample() like so:

sample("name of this sample", function()
        -- nested for loops, lots of table creation, member access...
end)

I have a chunk of code I want to know how long it takes on the device to run. It’s a function calling a bunch of functions:

function updateCombatEnvironment()
advanceTime(10)
setupLightingConditions()
setupEnvironmentVariables()
setupRanges()
setupTacticalChartView()
setupTDCView()
end

What’s the syntax to sample the entire updateCombatEnvironment() function?