Just some random things one could try to get acquainted with Go... only to be used if you lack the creativity to come up with your own ideas ;-)
- Install Go
- Maybe configure your preferred text editor for Go
Write a Hello World in Go :-)
Optional: Write a function that returns a new function. The latter is supposed to return the next Fibonacci number on each call. That is, fill out the missing parts here:
package main
import "fmt"
func fibonacci() func() int {
// ???
// Hint: Variables that are declared here are "attached" to the inner function instance and can be used to persist state across function calls.
return func() int {
// ???
}
}
func main() {
nextFibonacci := fibonacci()
fmt.Println(nextFibonacci()) // 1
fmt.Println(nextFibonacci()) // 1
fmt.Println(nextFibonacci()) // 2
fmt.Println(nextFibonacci()) // 3
fmt.Println(nextFibonacci()) // 5
fmt.Println(nextFibonacci()) // 8
}
Write a function that prints the elements of an array to stdout. Call this several times in parallel using goroutine. Here's a snippet for you to get you started.
package main
import (
"fmt"
)
func print(arr []string) {
for _, v := range arr {
fmt.Println(v)
}
}
func main() {
// ???
}
Hint: Go does not wait for goroutines to finish before it terminates. If your program terminates prematurely, this SO answer might help.
Write two functions named send and receive, both taking a int channel (chan int) as their only argument. Make the send function write some integers to the channel. Make the receive function read from the channel and print the elements it reads to stdout. Call both in your main with the same channel object.
- Write a simple http server that responds to every request with 200 OK and some text
- Write a simple http server that renders an html page (for example, by using package html/template)
- Have that server read stuff from multiple files in parallel and report the content back (in the html output)
- Have the server call remote APIs (twitter, forecast.io, github, movie database, whatever you like) in parallel. Push the results of that into the html page.