字符串向量上的连接运算符的等价物是什么？

Question

我无法在 String 向量上找到 "join" 运算符的 Rust 等价物。我有一个 Vec<String>，我想作为一个人加入他们 String:

let string_list = vec!["Foo".to_string(),"Bar".to_string()];
let joined = something::join(string_list,"-");
assert_eq!("Foo-Bar", joined);

相关：

Answer 1

在 Rust 1.3.0 及更高版本中，join 可用：

fn main() {
    let string_list = vec!["Foo".to_string(),"Bar".to_string()];
    let joined = string_list.join("-");
    assert_eq!("Foo-Bar", joined);
}

在 1.3.0 之前此方法被调用 connect:

let joined = string_list.connect("-");

请注意，您不需要导入任何内容，因为这些方法由 standard library prelude 自动导入。

Answer 2

正如威尔弗雷德所说，SliceConcatExt::connect has been deprecated since version 1.3.0 in favour of SliceConcatExt::join：

let joined = string_list.join("-");

Answer 3

itertools crate also called join 中有一个函数连接了一个迭代器：

extern crate itertools; // 0.7.8

use itertools::free::join;
use std::fmt;

pub struct MyScores {
    scores: Vec<i16>,
}

impl fmt::Display for MyScores {
    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
        fmt.write_str("MyScores(")?;
        fmt.write_str(&join(&self.scores[..], &","))?;
        fmt.write_str(")")?;
        Ok(())
    }
}

fn main() {
    let my_scores = MyScores {
        scores: vec![12, 23, 34, 45],
    };
    println!("{}", my_scores); // outputs MyScores(12,23,34,45)
}

字符串向量上的连接运算符的等价物是什么？

What is the equivalent of the join operator over a vector of Strings?

string

rust