119 lines
2.9 KiB
Rust
119 lines
2.9 KiB
Rust
use std::convert::TryFrom;
|
|
use ::std::collections::HashMap;
|
|
|
|
|
|
#[derive(Debug)]
|
|
pub struct NewStatsCalculator<'a> {
|
|
data: &'a mut Vec<i32>,
|
|
length: u32,
|
|
total: i32,
|
|
}
|
|
|
|
impl<'a> NewStatsCalculator<'a> {
|
|
pub fn from_vec(initial_data: &'a mut Vec<i32>) -> Self {
|
|
let mut instance = NewStatsCalculator {
|
|
data: initial_data,
|
|
length: 0,
|
|
total: 0,
|
|
};
|
|
instance.get_length();
|
|
instance.get_total();
|
|
instance
|
|
}
|
|
|
|
// pub fn initialise(&mut self) -> () {
|
|
// self.total = self.data.iter().sum();
|
|
// let length = i32::try_from(self.data.len());
|
|
// // self.length = match length {
|
|
// // Ok(i) => i,
|
|
// // _ => 0,
|
|
// // };
|
|
// if let Ok(i) = length {
|
|
// self.length = i;
|
|
// } else {
|
|
// self.length = 0;
|
|
// }
|
|
// }
|
|
|
|
fn get_length(&mut self) {
|
|
let length = u32::try_from(self.data.len());
|
|
|
|
if let Ok(i) = length {
|
|
self.length = i;
|
|
} else {
|
|
self.length = 0;
|
|
}
|
|
}
|
|
|
|
fn get_total(&mut self) {
|
|
self.total = self.data.iter().sum();
|
|
}
|
|
|
|
pub fn get_mean(&self) -> f32 {
|
|
self.total as f32 / self.length as f32
|
|
}
|
|
|
|
pub fn get_median(&mut self) -> f32 {
|
|
let mid = self.length as usize / 2;
|
|
|
|
self.data.sort_unstable();
|
|
|
|
if self.length % 2 == 0 {
|
|
(self.data[mid - 1] as f32 + self.data[mid] as f32) / 2.0
|
|
} else {
|
|
self.data[mid] as f32
|
|
}
|
|
}
|
|
|
|
// pub fn get_mode(&self) -> HashMap<&mut i32, i32> {
|
|
// let mut mode = HashMap::new();
|
|
// for ref i in self.data {
|
|
// let count = mode.entry(i).or_insert(0);
|
|
// *count += 1;
|
|
// }
|
|
// mode
|
|
// }
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod test {
|
|
use super::*;
|
|
|
|
#[test]
|
|
fn test_get_length() {
|
|
let mut data = vec![1, 2, 3, 4, 5, 6];
|
|
let mut test = NewStatsCalculator::from_vec(&mut data);
|
|
test.get_length();
|
|
assert_eq!(test.length, 6);
|
|
}
|
|
|
|
#[test]
|
|
fn test_get_total() {
|
|
let mut data = vec![1, 2, 3, 4, 5, 6];
|
|
let mut test = NewStatsCalculator::from_vec(&mut data);
|
|
test.get_length();
|
|
assert_eq!(test.total, 21);
|
|
}
|
|
|
|
#[test]
|
|
fn test_get_mean() {
|
|
let mut data = vec![1, 2, 3, 4, 5, 6];
|
|
let test = NewStatsCalculator::from_vec(&mut data);
|
|
assert_eq!(test.get_mean(), 3.5);
|
|
}
|
|
|
|
#[test]
|
|
fn test_get_median_even() {
|
|
let mut data = vec![1, 2, 3, 4, 5, 6];
|
|
let mut test = NewStatsCalculator::from_vec(&mut data);
|
|
assert_eq!(test.get_median(), 3.5);
|
|
}
|
|
|
|
#[test]
|
|
fn test_get_median_odd() {
|
|
let mut data = vec![1, 2, 3, 4, 5, 6, 7];
|
|
let mut test = NewStatsCalculator::from_vec(&mut data);
|
|
assert_eq!(test.get_median(), 4.0);
|
|
}
|
|
}
|