Capturing iteration variables with Go

capturing_iteration_variables.go

package main

import "fmt"

func main() {
	tempDirs := []string{"one", "two", "three", "four", "five"}
	var rmdirs []func()

	for _, dir := range tempDirs {
		// Without this `dir := dir` line rmdir func would use outer `dir`
		// which is a reference that has been updated in successive loops so
		// accesses the last item repeatedly. With this line it uses the shadow
		// value correctly.
		dir := dir
		rmdirs = append(rmdirs, func() {
			fmt.Println(dir)
		})
	}

	// ...

	for _, rmdir := range rmdirs {
		rmdir()
	}
}