Rust Vector manipulation & slicing

Rust Vectors, Arrays, and Slices: Exercise-2 with Solution

Write a Rust program that creates a vector of characters containing the letters 'A' to 'Z'. Remove the first 7 elements from the vector and then slice it to get the last 10 elements. Print the resulting sub-vector.

Sample Solution:

Rust Code:

fn main() {
    // Create a vector of characters containing the letters 'A' to 'Z'
    let mut letters: Vec = ('A'..='Z').collect();

    // Remove the first 7 elements from the vector
    letters.drain(0..7);

    // Slice the vector to get the last 10 elements
    let sub_vector = &letters[letters.len() - 10..];

    // Print the resulting sub-vector
    println!("Resulting Sub-Vector: {:?}", sub_vector);
}

Output:

Resulting Sub-Vector: ['Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z']

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 mut letters: Vec<char> = ('A'..='Z').collect();: This line creates a vector named 'letters' of type Vec<char> and initializes it with characters from 'A' to 'Z' using the "collect()" method on a range.
• letters.drain(0..7);: This line removes the first 7 elements from the 'letters' vector using the "drain()" method with a range from 0 to 7 (exclusive).
• let sub_vector = &letters[letters.len() - 10..];: This line slices the 'letters' vector to get the last 10 elements. It uses the length of the vector to determine the starting index for the slice and then takes the last 10 elements.
• println!("Resulting Sub-Vector: {:?}", sub_vector);: This line prints the resulting sub-vector to the console using debug formatting. The {:?} format specifier is used to print the elements of the vector.

Rust Code Editor:

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