这是从文件中读取行并将它们分解成Rust中的单词的正确方法吗？(Is this the right way to read lines from file and split them into words in Rust?)

 
 
 编者按：本代码示例来自1.0之前的Rust版本，并且不具有语法上有效的Rust 1.0代码。 此代码的更新版本会产生不同的错误，但答案仍然包含有价值的信息。 
 
 
 我已经实现了下面的方法来从2维数据结构中的文件中返回单词： 
 
fn read_terms() -> Vec<Vec<String>> {
    let path = Path::new("terms.txt");
    let mut file = BufferedReader::new(File::open(&path));
    return file.lines().map(|x| x.unwrap().as_slice().words().map(|x| x.to_string()).collect()).collect();
}
 
 这是否是Rust中正确，习惯和有效的方式？ 我想知道collect()需要经常调用，以及是否需要在这里调用to_string()来分配内存。 也许返回类型应该被定义为不同的地方，以更加地道和有效？ 

 
 
Editor's note: This code example is from a version of Rust prior to 1.0 and is not syntactically valid Rust 1.0 code. Updated versions of this code produce different errors, but the answers still contain valuable information.
 
 
I've implemented the following method to return me the words from a file in a 2 dimensional data structure:
 
fn read_terms() -> Vec<Vec<String>> {
    let path = Path::new("terms.txt");
    let mut file = BufferedReader::new(File::open(&path));
    return file.lines().map(|x| x.unwrap().as_slice().words().map(|x| x.to_string()).collect()).collect();
}
 
Is this the right, idiomatic and efficient way in Rust? I'm wondering if collect() needs to be called so often and whether it's necessary to call to_string() here to allocate memory. Maybe the return type should be defined differently to be more idiomatic and efficient?

原文：https://stackoverflow.com/questions/25581463