Question

我有以下代码：

pub mod str {
    // http://stackoverflow.com/questions/27996430/reversing-a-string-in-rustlang-1-0-0/27996791#27996791
    pub fn reverse() -> String {
    let wordy: &str = "lowks";
    let wordy_reverse: String = wordy
        .graphemes(true)
        .rev()
        // .flat_map(|g| g.chars())
        .collect();
        // for word in wordy.words().rev() {
            //      print!("{}", word);
        // }
    wordy_reverse
    }

    pub fn sort() {
    let wordy: &'static str = "I am a hello world example"; //'
        let mut chars: Vec<char> = wordy.chars().collect();     
        chars.sort();
        for char in chars.iter() {
            println!("{}", char);
        }   
    }

    pub fn replace() -> String {
        let string_to_replace = String::from_str("Hello World!");
        let new_string: String = string_to_replace.replace("Hello", "Goodbye");
        format!("{} -> {}", string_to_replace, new_string)

    }
}

#[test]

fn test_replace() {
    assert_eq!("Hello World! -> Goodbye World!", str::replace());
    let reverse: String = str::reverse();
    assert_eq!("skwol", &*reverse);
}

我无法弄清楚如何更改sort函数以将其公开，以便我可以像其他两个一样添加测试。有人可以帮忙吗？

Answer 1

只需让sort返回Vec<char>：

pub fn sort() -> Vec<char> {
    let wordy: &'static str = "I am a hello world example";
    let mut chars: Vec<char> = wordy.chars().collect();     
    chars.sort();
    chars   
}

如何更改字符串排序功能以允许测试？

1 个答案: