Question

How to replace the last occurrence of a character in a string with Rust

Answer 1

fn replace_last_occurrence(s: &str, char_to_replace: char, replacement_char: char) -> String {
    let mut chars: Vec<char> = s.chars().collect();
    
    if let Some(pos) = chars.iter().rposition(|&c| c == char_to_replace) {
        chars[pos] = replacement_char;
    }
    
    chars.into_iter().collect()
}

fn main() {
    let s = "rust c++ c python c++ java c++ php";
    let char_to_replace = 'c';
    let replacement_char = 'W';

    let result = replace_last_occurrence(s, char_to_replace, replacement_char);
    
    println!("{}", result);
}


  
/*
run:

rust c++ c python c++ java W++ php

*/

 

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