Question

How to check if a string is blank (empty, none, or contains only whitespace) in Rust

Answer 1

fn is_blank_or_empty(str: Option<&str>) -> bool {
    // Check for None or empty string
    match str {
        Some(s) if !s.is_empty() => {
            // Check if the string contains only whitespace
            s.chars().all(|ch| ch.is_whitespace())
        }
        _ => true, // Handles None or empty strings
    }
}

fn main() {
    let test_cases = vec![
        None,
        Some(""),
        Some("   "),
        Some("abc"),
    ];

    for (index, test) in test_cases.iter().enumerate() {
        println!("Test{}: {}", index + 1, is_blank_or_empty(*test));
    }
}

   
    
/*
run:
    
Test1: true
Test2: true
Test3: true
Test4: false
    
*/

 

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