A small piece of code to illustrate vars captured by range expressions in Golang.

capturedVarsFix.go

package main

import (
	"fmt"
	"sync"
)

func main() {
	// My opinions on people.
	peopleOpinions := map[string]string{
		"John Frusciante": "Such a cool dude!",
		"Napoleon":        "Tiny fella.",
		"Kanye West":      "Has some weird startup ideas, I guess?",
	}
	// A wait group so that main() doesn't return before the goroutines print my opinions. (They're SO important!)
	wg := new(sync.WaitGroup)
	// Iterate through each key/ value pair in the map.
	for n, o := range peopleOpinions {
		name := n
		opinion := o
		// Add one task to the waitgroup.
		wg.Add(1)
		go func() {
			fmt.Printf("What I think about %s: %s\n", name, opinion)
			// Notify the wait group: my opinion was printed. All good!
			wg.Done()
		}()
	}
	// Wait for all the goroutines to have returned.
	wg.Wait()
}