add benchmarks for iteration.go

bench_iteration_test.go

@@ -0,0 +1,42 @@
+package goquery
+
+import (
+	"testing"
+)
+
+func BenchmarkEach(b *testing.B) {
+	var tmp, n int
+
+	b.StopTimer()
+	sel := DocW().Root.Find("td")
+	f := func(i int, s *Selection) {
+		tmp++
+	}
+	b.StartTimer()
+	for i := 0; i < b.N; i++ {
+		sel.Each(f)
+		if n == 0 {
+			n = tmp
+		}
+	}
+	b.Logf("Each=%d", n)
+}
+
+func BenchmarkMap(b *testing.B) {
+	var tmp, n int
+
+	b.StopTimer()
+	sel := DocW().Root.Find("td")
+	f := func(i int, s *Selection) string {
+		tmp++
+		return string(tmp)
+	}
+	b.StartTimer()
+	for i := 0; i < b.N; i++ {
+		sel.Map(f)
+		if n == 0 {
+			n = tmp
+		}
+	}
+	b.Logf("Map=%d", n)
+}