do  -- Time a function

    local function timeFunction( f : function ) : number
        local startTime = os.micros()
        f()
        return os.micros() - startTime
    end

    local function toBeTimed() : void
        os.sleep( 1234 ) -- sleep 1.234 seconds
    end

    print( $"{ timeFunction( toBeTimed ) / 1_000_000 } seconds" )
end