make-batches.go

package main

import (
	"fmt"
	"math"
)

func makeBatches(batchSize int, size int) [][]int {
	batches := [][]int{}
	nbBatches := int(math.Ceil(float64(size) / float64(batchSize)))
	for b := 0; b < nbBatches; b++ {
		start := b * batchSize
		end := (b+1) * batchSize
		if size < end {
			end = size
		}
		batches = append(batches, []int{start, end})
	}
	// fmt.Printf("%+v\n", batches)
	return batches
}

func makeRange(min, max int) []int {
    a := make([]int, max-min+1)
    for i := range a {
        a[i] = min + i
    }
    return a
}

func main() {
	a := makeRange(1, 23)
	fmt.Println(a)
	for bi, batch := range makeBatches(10, len(a)) {
		fmt.Printf("batch %d (length %d)\n", bi, batch[1] - batch[0])
		fmt.Printf("  %+v\n", makeRange(batch[0], batch[1]))
		fmt.Printf("  %+v\n", a[batch[0]:batch[1]])
	}
}