Mastering Go - Second Edition

Another example of the context package

In this section, you are going to learn even more about the context package because it is such a powerful and unique package of the Go standard library. This time, we are going to create a context that uses the context.TODO() function instead of the context.Background() function. Although both functions return a non-nil, empty Context, their purposes differ. We are also going to illustrate the use of the context.WithValue() function. The name of the program that will be developed in this section is moreContext.go, and it will be presented in four parts.

The first part of moreContext.go is as follows:

package main 
 
import ( 
    "context" 
    "fmt" 
) 
 
type aKey string 

The second part of moreContext.go contains ...