Minimal example of Go 1.22 experimental rangefunc

rangefunc.go

package main

import "fmt"

func minimalIncomplete(yield func(int, string) bool) {
	for i := range 9 {
		// If yield returns false because of break/return and we don't check,
		// the calling range loop will panic.
		yield(i, fmt.Sprintf("==%d==", i))
	}
}

func minimal(yield func(int, string) bool) {
	for i := range 9 {
		if !yield(i, fmt.Sprintf("==%d==", i)) {
			return
		}
	}
}

func main() {
	fmt.Println("Minimal without break handling:")
	for i, x := range minimalIncomplete {
		fmt.Println(i, x)
	}

	fmt.Println("Minimal:")
	for i, x := range minimal {
		if i < 3 {
			continue
		}
		if i > 6 {
			break
		}
		fmt.Println(i, x)
	}
}