feat: remove unnecessary Size function

db/db.go

@@ -4,7 +4,6 @@ import "errors"
 
 type TzDBIndex interface {
 	Lookup(lat, lon float64) (string, error)
-	Size() int
 }
 
 var (

db/rtree.go

@@ -15,7 +15,6 @@ import (
 type Geo2TzRTreeIndex struct {
 	land rtree.RTreeG[timezoneGeo]
 	sea  rtree.RTreeG[timezoneGeo]
-	size int
 }
 
 // IsOcean checks if the timezone is for oceans
@@ -25,7 +24,6 @@ func IsOcean(label string) bool {
 
 // Insert adds a new timezone bounding box to the index
 func (g *Geo2TzRTreeIndex) Insert(min, max [2]float64, element timezoneGeo) {
-	g.size++
 	if IsOcean(element.Name) {
 		g.sea.Insert(min, max, element)
 		return
@@ -117,11 +115,6 @@ func (g *Geo2TzRTreeIndex) Lookup(lat, lng float64) (tzID string, err error) {
 	return
 }
 
-// Size returns the number of timezones in the index
-func (g *Geo2TzRTreeIndex) Size() int {
-	return g.size
-}
-
 // isPointInPolygonPIP checks if a point is inside a polygon using the Point in Polygon algorithm
 func isPointInPolygonPIP(point vertex, polygon polygon) bool {
 	oddNodes := false

db/rtree_test.go

@@ -21,7 +21,6 @@ func TestGeo2TzTreeIndex_LookupZone(t *testing.T) {
 	// load the database
 	gsi, err := NewGeo2TzRTreeIndexFromGeoJSON("../tzdata/timezones.zip")
 	assert.NoError(t, err)
-	assert.NotEmpty(t, gsi.Size())
 
 	// load the coordinates
 	err = helpers.LoadJSON("testdata/coordinates.json", &tests)
@@ -46,7 +45,6 @@ func BenchmarkGeo2TzTreeIndex_LookupZone(b *testing.B) {
 	// load the database
 	gsi, err := NewGeo2TzRTreeIndexFromGeoJSON("../tzdata/timezones.zip")
 	assert.NoError(b, err)
-	assert.NotEmpty(b, gsi.Size())
 
 	// load the coordinates
 	var tests []struct {