Modifying Arrays

Part of the Fundamentals section of Coddy's Rust journey — lesson 58 of 75.

In addition to accessing the elements of an array, you can also modify them. To modify a specific element, first you need mut to make an array modifiable, and then you can assign a new value to it using its index.

Here's an example:

let mut my_array = ["apple", "banana", "cherry"];
my_array[1] = "orange";
println!("{}, {}, {}", my_array[0], my_array[1], my_array[2]);

Output:

apple, orange, cherry

banana was changed to an orange.

Challenge

Easy

Create a program that receives 3 inputs:

First input is a string of values separated by a comma (for example 1,2,3,4,5) of length 5.
Second input is an index
Third input is a new element

The starter code already converts the comma-separated string into a mutable array called arr — you can work directly with it without writing any conversion code.

The program will print a modified array by changing the element at the index stored in the second input with the value from the third input.

Try it yourself

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

fn main() {
    let mut input_str_arr = String::new();
    let mut input_index = String::new();
    let mut new_element = String::new();
    io::stdin().read_line(&mut input_str_arr).unwrap();
    io::stdin().read_line(&mut input_index).unwrap();
    io::stdin().read_line(&mut new_element).unwrap();

    let new_element = new_element.trim().to_string();
    let index: usize = input_index.trim().parse().unwrap();
    let mut arr: [String; 5] = input_str_arr.split(',').map(String::from).collect::<Vec<String>>().try_into().unwrap();
    
    // Write your code below
    // Use arr, index and new_element to solve the challenge    

    for i in 0..arr.len() {
        print!("{} ", arr[i]);
    }
}