feat: observer pattern for statistics

internal/statistics/results.go

@@ -0,0 +1,23 @@
+package statistics
+
+import (
+	"fmt"
+	"strings"
+)
+
+type Results struct {
+	StepsTaken  uint64 // Number of steps taken during execution.
+	TimeElapsed uint64 // The time (ms) taken for execution to complete.
+}
+
+func (r Results) OpsPerSecond() float32 {
+	return float32(r.StepsTaken) / (float32(r.TimeElapsed) / 1000)
+}
+
+func (r Results) String() string {
+	builder := strings.Builder{}
+	fmt.Fprintln(&builder, "Time Spent:", r.TimeElapsed, "ms")
+	fmt.Fprintln(&builder, "Steps:", r.StepsTaken)
+	fmt.Fprintln(&builder, "Speed:", r.OpsPerSecond(), "ops")
+	return builder.String()
+}