Исходники и презентации

lessons/strings/string_builder/speed_test.go

@@ -0,0 +1,38 @@
+package main
+
+import (
+	"strings"
+	"testing"
+)
+
+// go test -bench=. speed_test.go
+
+func BenchmarkSimpleConcatenation(b *testing.B) {
+	str := "test"
+	for i := 0; i < b.N; i++ {
+		str += "test"
+	}
+
+	_ = str
+}
+
+func BenchmarkConcatenationWithStringBuilder(b *testing.B) {
+	builder := strings.Builder{}
+	builder.WriteString("test")
+	for i := 0; i < b.N; i++ {
+		builder.WriteString("test")
+	}
+
+	_ = builder.String()
+}
+
+func BenchmarkConcatenationWithStringBuilderOptimized(b *testing.B) {
+	builder := strings.Builder{}
+	builder.Grow(4 + b.N*4)
+	builder.WriteString("test")
+	for i := 0; i < b.N; i++ {
+		builder.WriteString("test")
+	}
+
+	_ = builder.String()
+}