updated.go

package main

import "fmt"

func SliceToGroupsUpdated[T any](slice []T, limit int) [][]T {
	if limit < 1 {
		limit = 1
	}

	matrix := [][]T{{}}
	row := 0
	for _, val := range slice {
		matrix[row] = append(matrix[row], val)
		if len(matrix[row]) == limit {
			row++
			matrix = append(matrix, []T{})
		}
	}

	return matrix
}

func SliceToGroupsOrig[T any](vals []T, grpSize int) [][]T {
	if grpSize < 1 {
		grpSize = 1
	}

	grps := make([][]T, 0)
	grp := make([]T, 0, grpSize)
	for _, val := range vals {
		grp = append(grp, val)

		if len(grp) >= grpSize {
			grps = append(grps, grp)
			grp = make([]T, 0, grpSize)
		}
	}

	return grps
}

func main() {
	grps := SliceToGroupsUpdated([]string{"a", "b", "c"}, 0)
	fmt.Println("updated", grps)

	grps = SliceToGroupsOrig([]string{"a", "b", "c"}, 0)
	fmt.Println("original", grps)
}