Adding latest

src/stats.rs

@@ -2,16 +2,22 @@ use std::convert::TryFrom;
 
 #[derive(Debug)]
 pub struct StatsCalculator {
-    data: Vec<i32>,
+    data: &Vec<i32>,
+    length: i32,
+    total: i32,
 }
 
 impl StatsCalculator{
     pub fn default_data() -> Self {
-        Self::from_vec(vec![1, 2, 3, 4, 5, 6, 7, 8, 9, 10])
+        Self::from_vec(&vec![1, 2, 3, 4, 5, 6, 7, 8, 9, 10])
     }
 
-    pub fn from_vec(initial_data: Vec<i32>) -> Self {
-        return StatsCalculator { data: initial_data };
+    pub fn from_vec(&initial_data: &Vec<i32>) -> Self {
+        return StatsCalculator {
+            data: &initial_data,
+            length: Self::get_length(&initial_data),
+            total: Self::get_total(&initial_data),
+        };
     }
 
     // pub fn initialise(&mut self) -> () {
@@ -28,8 +34,8 @@ impl StatsCalculator {
     //     }
     // }
 
-    fn get_length(&self) -> i32 {
-        let length = i32::try_from(self.data.len());
+    fn get_length(&initial_data: &Vec<i32>) -> i32 {
+        let length = i32::try_from(initial_data.len());
 
         if let Ok(i) = length {
             return i;
@@ -38,23 +44,20 @@ impl StatsCalculator {
         }
     }
 
-    fn get_total(&self) -> i32 {
-        return self.data.iter().sum();
+    fn get_total(&initial_data: &Vec<i32>) -> i32 {
+        return initial_data.iter().sum();
     }
 
     pub fn get_mean(&self) -> f32 {
-        let total = self.get_total();
-        let length = self.get_length();
-        return total as f32 / length as f32;
+        return self.total as f32 / self.length as f32;
     }
 
     pub fn get_median(&mut self) -> f32 {
-        let length = self.get_length();
-        let mid = length as usize / 2;
+        let mid = self.length as usize / 2;
 
         self.data.sort();
 
-        if length % 2 != 0 {
+        if self.length % 2 != 0 {
             return self.data[mid] as f32;
         } else {
             return (self.data[mid - 1] as f32 + self.data[mid] as f32) / 2.0;