Vowel Counter
This Rust function, count_vowels, takes a string slice (&str) as input and returns the number of vowels (both lowercase and uppercase) present in the string. It works by iterating over each character in the input string and checking if the character is a vowel (one of "a, e, i, o, u, A, E, I, O, U").
The function uses Rust’s built-in iterator methods—chars() to convert the string into a sequence of characters and filter() to keep only the vowels. The count() method is then used to return the number of filtered vowels.
This function is useful in scenarios where you need to analyze text for vowel counts, such as in educational tools, text processing, or language-based applications.
Example usage:
let input = "Hello, Rustacean!";
let vowel_count = count_vowels(input);
println!("The number of vowels in '{}' is: {}", input, vowel_count);
