Rust vector filtering guide

Last update on December 21 2024 10:21:54 (UTC/GMT +8 hours)

Write a Rust program to create a vector with integers from 1 to 10. Filter out even numbers from the vector and print the resulting vector.

Sample Solution:

Rust Code:

// Define the main function
fn main() {
    // Create a vector with integers 1 to 10
    let numbers: Vec<i32> = (1..=10).collect(); // Use the collect() method to create a vector from a range

    // Filter out odd numbers and collect the result into a new vector
    let even_numbers: Vec<i32> = numbers.into_iter() // Convert the vector into an iterator
        .filter(|&x| x % 2 == 0) // Use the filter method to keep only even numbers
        .collect(); // Collect the filtered elements back into a vector

    // Print the resulting vector with even numbers
    println!("Even numbers: {:?}", even_numbers);
}

Output:

Even numbers: [2, 4, 6, 8, 10]

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 program.
• let numbers: Vec<i32> = (1..=10).collect();: This line creates a vector named numbers containing integers from 1 to 10 using the "collect()" method with a range (1..=10).
• let even_numbers: Vec<i32> = numbers.into_iter(): This line starts the process of filtering out odd numbers by converting the 'numbers' vector into an iterator. The "into_iter()" method consumes the 'numbers' vector, allowing for iteration over its elements.
• .filter(|&x| x % 2 0): This line filters the elements of the iterator, keeping only those elements 'x' for which x % 2 0 is true (i.e., even numbers).
• .collect();: This line collects the filtered elements back into a new vector named 'even_numbers'.
• println!("Even numbers: {:?}", even_numbers);: This line prints the 'even_numbers' vector to the console. The {:?} syntax is used for debug formatting, which is suitable for printing the contents of collections like vectors.

Rust Code Editor:

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