Common Array Operations

Part of the Fundamentals section of Coddy's Rust journey — lesson 68 of 75.

Here are some common array operations:

Find the sum of all elements in an array:

let numbers = [1, 2, 3, 4, 5];
let mut sum = 0;
for number in &numbers {
    sum += number;
}
println!("Sum: {}", sum);

Find the average of elements in an array:

let numbers = [1, 2, 3, 4, 5];
let mut sum = 0;
for number in &numbers {
    sum += number;
}
let average = sum as f64 / numbers.len() as f64;
println!("Average: {}", average);

Find the maximum element in an array:

let numbers = [1, 5, 2, 9, 3];
let mut max = numbers[0];
for &number in &numbers[1..] {
    if number > max {
        max = number;
    }
}
println!("Max: {}", max);

Find the minimum element in an array:

let numbers = [1, 5, 2, 9, 3];
let mut min = numbers[0];
for &number in &numbers[1..] {
    if number < min {
        min = number;
    }
}
println!("Min: {}", min);

Challenge

Easy

Create a function named calculate_stats that takes an array of integers of length 8 as input and performs the following operations:

Calculates the sum of all elements in the array.
Calculates the average of the elements in the array.
Finds the maximum element in the array.
Finds the minimum element in the array.

The function should return an array of doubles containing the sum, average, maximum, and minimum, in that order.

Cheat sheet

Common array operations in Rust:

Sum of all elements:

let numbers = [1, 2, 3, 4, 5];
let mut sum = 0;
for number in &numbers {
    sum += number;
}

Average of elements:

let numbers = [1, 2, 3, 4, 5];
let mut sum = 0;
for number in &numbers {
    sum += number;
}
let average = sum as f64 / numbers.len() as f64;

Maximum element:

let numbers = [1, 5, 2, 9, 3];
let mut max = numbers[0];
for &number in &numbers[1..] {
    if number > max {
        max = number;
    }
}

Minimum element:

let numbers = [1, 5, 2, 9, 3];
let mut min = numbers[0];
for &number in &numbers[1..] {
    if number < min {
        min = number;
    }
}

Try it yourself

use std::io;
use std::convert::TryInto;

fn calculate_stats(arr: [i32; 8]) -> [f64; 4] {
    // Write your code here
    
    
}

fn main() {
    let mut input_str_arr = String::new();
    io::stdin().read_line(&mut input_str_arr).unwrap();
    let numbers: [i32; 8] = input_str_arr.split(',').map(|s| s.parse::<i32>().unwrap()).collect::<Vec<i32>>().try_into().unwrap();
    let stats = calculate_stats(numbers);
    println!("Sum: {}", stats[0]);
    println!("Average: {}", stats[1]);
    println!("Maximum: {}", stats[2]);
    println!("Minimum: {}", stats[3]);
}