fold examples for Tom

main.rs

use std::cmp;

fn sum(numbers: Vec<i32>) -> i32 {
    numbers.iter().fold(0, |total, num| total + num)
}

fn biggest_word(words: Vec<&str>) -> usize {
    words.iter().fold(0, |length, word| cmp::max(length, word.chars().count()))
}

fn main() {
    let numbers = vec![1,2,3,4,5,6,7,8,9,10];
    let total = sum(numbers);
    println!("the total of 1 to 10 is {}", total);

    let words = vec!["foo", "bar", "blah", "stuff", "thing", "the"];
    let biggest = biggest_word(words);
    println!("the longest word has length {}", biggest);
}