Can you use break statement in functions, or just loops?

break only works in loops, however, you can end a function by using return.

function loopThroughMeTableForValue(table,value) -- some function
	for i,v in pairs(table) do --loops through the table
		if v == value then --checks if the desired value is found, and if it is
			return i --returns the index of the value, and ends the function right there
		end
	end
	return "Didn't find it"  --if the function made it this far, then it didn't find the requested value
end

You can find more about return here.