time.AfterFunc() Function in Golang With Examples

// Golang program to illustrate the usage of
// AfterFunc() function

// Including main package
package main

// Importing fmt and time
import (
    "fmt"
    "time"
)

// Main function
func main() {

    // Defining duration parameter of
    // AfterFunc() method
    DurationOfTime := time.Duration(3) * time.Second

    // Defining function parameter of
    // AfterFunc() method
    f := func() {

        // Printed when its called by the
        // AfterFunc() method in the time
        // stated above
        fmt.Println("Function called by "+
            "AfterFunc() after 3 seconds")
    }

    // Calling AfterFunc() method with its
    // parameter
    Timer1 := time.AfterFunc(DurationOfTime, f)

    // Calling stop method 
    // w.r.to Timer1
    defer Timer1.Stop()

    // Calling sleep method
    time.Sleep(10 * time.Second)
}

// Golang program to illustrate the usage of
// AfterFunc() function

// Including main package
package main

// Importing fmt and time
import (
    "fmt"
    "time"
)

// Main function
func main() {

    // Creating channel using
    // make keyword
    mychan := make(chan int)

    // Calling AfterFunc() method
    // with its parameters
    time.AfterFunc(6*time.Second, func() {

        // Printed after stated duration
        // by AfterFunc() method is over
        fmt.Println("6 seconds over....")

        // loop stops at this point
        mychan <- 30
    })

    // Calling for loop
    for {

        // Select statement
        select {

        // Case statement
        case n := <-mychan:

            // Printed after the loop stops
            fmt.Println(n, "is arriving")
            fmt.Println("Done!")
            return

        // Returned by default
        default:

            // Printed until the loop stops
            fmt.Println("time to wait")

            // Sleeps for 3 seconds
            time.Sleep(3 * time.Second)
        }
    }
}