Question

How to get the indexes of words from an array of strings that start with a specific letter in Rust

Answer 1

fn main() {
    let words = ["zero", "one", "two", "three", "four", "five", 
                 "six", "seven", "eight", "nine", "ten"];
    let specificletter = 't';
    
    let indexes: Vec<usize> = words.iter()
                                   .enumerate()
                                   .filter(|(_, &word)| word.starts_with(specificletter))
                                   .map(|(index, _)| index)
                                   .collect();
    
    println!("{:?}", indexes);
}

 
      
/*
run:
   
[2, 3, 10]
     
*/

 

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