Longest Word in Rust

Published on 09 April 2023 (Updated: 09 April 2023)

Welcome to the Longest Word in Rust page! Here, you'll find the source code for this program as well as a description of how the program works.

Current Solution

use std::env::args;
use std::process::exit;

fn usage() -> ! {
    println!("Usage: please provide a string");

fn get_longest_word_len(s: &str) -> usize {
        .map(|t| t.len())

fn main() {
    let mut args = args().skip(1);

    // Exit if 1st command-line argument is empty
    let s: &str = &args
        .unwrap_or_else(|| usage());
    if s.len() < 1 {

    // Get longest word length and display it
    println!("{}", get_longest_word_len(s));

Longest Word in Rust was written by:

If you see anything you'd like to change or update, please consider contributing.

Note: The solution shown above is the current solution in the Sample Programs repository as of May 08 2023 19:53:07. The solution was first committed on Apr 09 2023 10:44:25. As a result, documentation below may be outdated.

How to Implement the Solution

No 'How to Implement the Solution' section available. Please consider contributing.

How to Run the Solution

No 'How to Run the Solution' section available. Please consider contributing.