Rust Array Mapping & Slicing

Rust Vectors, Arrays, and Slices: Exercise-10 with Solution

Write a Rust program that creates an array of integers of size 9. Map each element of the array to its cube. Slice the resulting array to get a sub-array containing the elements from index 1 to index 6. Print the sub-array.

Sample Solution:

Rust Code:

fn main() {
    // Declare an array of integers with size 9
    let numbers: [i32; 9] = [1, 2, 3, 4, 5, 6, 7, 8, 9];

    // Map each element of the array to its cube
    let cubed_numbers: Vec<i32> = numbers.iter().map(|&x| x * x * x).collect();

    // Slice the resulting vector to get a sub-array containing the elements from index 1 to index 6
    let sub_array = &cubed_numbers[1..7];

    // Print the sub-array
    println!("Sub-Array: {:?}", sub_array);
}

Output:

Sub-Array: [8, 27, 64, 125, 216, 343]

Explanation:

Here is a brief explanation of the above Rust code:

• fn main() { ... }: This line defines the main function, which is the entry point of the Rust program.
• let numbers: [i32; 9] = [...];: This line declares an array named 'numbers' of type [i32; 9] (array of integers with size 9) and initializes it with integers from 1 to 9.
• let cubed_numbers: Vec<i32> = ...: This line maps each element of the 'numbers' array to its cube using the map method and collects the results into a new vector named cubed_numbers.

• let sub_array = &cubed_numbers[1..7];: This line slices the 'cubed_numbers' vector to get a sub-array containing the elements from index 1 to index 6.
• println!("Sub-Array: {:?}", sub_array);: This line prints the sub-array to the console using debug formatting. The {:?} format specifier is used to print the elements of the array slice.

Rust Code Editor:

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