maps vs slices for mapping small sets of ordinals to values

mapvslice_test.go

package whatever

import (
	"testing"
)

func BenchmarkMapConstruction(b *testing.B) {
	space := make([]map[int][]string, b.N)
	for n := 0; n < b.N; n++ {
		space[n] = map[int][]string{
			0: []string{},
			1: []string{},
			2: []string{},
			3: []string{},
		}
	}
}

func BenchmarkSliceConstruction(b *testing.B) {
	space := make([][][]string, b.N)
	for n := 0; n < b.N; n++ {
		space[n] = make([][]string, 4)
	}
}

$  go test -bench=. -run "XXX"
BenchmarkMapConstruction-4     	 3000000	       562 ns/op
BenchmarkSliceConstruction-4   	10000000	       104 ns/op
PASS