Cobra既是一个用来创建强大的现代CLI命令行的golang库，也是一个生成程序应用和命令行文件的程序。下面是Cobra使用的一个演示：

在计算机科学领域，反射是指一类应用，它们能够自描述和自控制。也就是说，这类应用通过采用某种机制来实现对自己行为的描述（self-representation）和监测（examination），并能根据自身行为的状态和结果，调整或修改应用所描述行为的状态和相关的语义

Channels by default are blocking on sending and receiving values, so they will be waited on

Finally, we add the `xml:"sitemap"` syntax at the end for the parser to understand where it's looking when we go to unpack this with the encoding/xml package.

type Sitemapindex struct {
    Locations []Location `xml:"sitemap"`
}

Personally, I would test both. If the gains are insignificant by using value receivers where possible and you are using pointer receivers, sure, use all pointer receivers. If you can make sizeable gains by using value receivers where possible, however, I would personally use them.

Now, we're modifying the struct itself via pointer. Now in the code we could do something like a_car.new_top_speed(500), and this would actually modify the object itself.

between the func keyword and the name of the function, we pass the variable and type. We use c, short for car, and then car, which is in association with the car struct. In this case, the method gets a copy of the object, so you cannot actually modify it here, you can only take actions or do something like coming up with a calculation

func (c car) kmh() float64 {
    return float64(c.gas_pedal) * (c.top_speed_kmh/usixteenbitmax)
}

In order to do this, we don't need to actually modify the a_car variable, so we can use a method on a value, called a value receiver:

func (c car) kmh() float64 {
    return float64(c.gas_pedal) * (c.top_speed_kmh/usixteenbitmax)
}

Methods that just access values are called value receivers and methods that can modify information are pointer receivers.