Added stat methods and anomaly detection algorithm

types/statDB.go

@@ -50,3 +50,15 @@ func (statDB *StatDB) IsKeyInvalid(key string) bool {
 
 	return true
 }
+
+func (statDB *StatDB) GetCityStatistics(cityName string) []Weather {
+	result := make([]Weather, 0)
+
+	for key, record := range statDB.db {
+		if strings.HasSuffix(key, cityName) {
+			result = append(result, record)
+		}
+	}
+
+	return result
+}

types/statistics.go

@@ -10,12 +10,12 @@ type WeatherAnomaly struct {
 // The StatResult data type, representing weather statistics
 // of past meteorological events
 type StatResult struct {
-	Min     float64        `json:"min"`
-	Max     float64        `json:"max"`
-	Count   int            `json:"count"`
-	Mean    float64        `json:"mean"`
-	StdDev  float64        `json:"stdDev"`
-	Median  float64        `json:"median"`
-	Mode    float64        `json:"mode"`
-	Anomaly WeatherAnomaly `json:"anomaly"`
+	Min     float64           `json:"min"`
+	Max     float64           `json:"max"`
+	Count   int               `json:"count"`
+	Mean    float64           `json:"mean"`
+	StdDev  float64           `json:"stdDev"`
+	Median  float64           `json:"median"`
+	Mode    float64           `json:"mode"`
+	Anomaly *[]WeatherAnomaly `json:"anomaly"`
 }