Divide slice into batches

batch.go

// run at: https://play.golang.org/p/bhgYlgGbdHz
package main

import (
	"fmt"
)

func main() {
	total := 22
	batch := 3

	batches := [][]string{}
	ids := initSlice(total)
	for i := 0; i < len(ids); i += batch {
		end := i+batch
	        if end > len(ids) {
			end = len(ids)
		}
		batches = append(batches, ids[i:end])
	}

	fmt.Println("batches:")
	for _, b := range batches {
		fmt.Printf("%v", b)
	}

}

func initSlice(n int) []string {
	res := make([]string, n)
	for i := 0; i < n; i++ {
		res[i] = fmt.Sprintf("id-%d", i)
	}
	return res
}