string 如何将 Vec<char> 转换为字符串

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时间:2020-09-09 02:16:33  来源:igfitidea点击:

How to convert Vec<char> to a string

stringrust

提问by user3596561

How to convert Vec<char>to string form so that I can print it?

如何转换Vec<char>为字符串形式以便我可以打印它?

回答by Vladimir Matveev

Use collect()on an iterator:

使用collect()上的迭代器:

let v = vec!['a', 'b', 'c', 'd'];
let s: String = v.into_iter().collect();
println!("{}", s);

The original vector will be consumed. If you need to keep it, use v.iter():

原始向量将被消耗。如果您需要保留它,请使用v.iter()

let s: String = v.iter().collect();

There is no more direct way because charis a 32-bit Unicode scalar value, and strings in Rust are sequences of bytes (u8) representing text in UTF-8 encoding. They do not map directly to sequences of chars.

没有更直接的方法,因为char是 32 位 Unicode 标量值,而 Rust 中的字符串是u8表示 UTF-8 编码文本的字节序列 ( )。它们不直接映射到chars 的序列。

回答by malbarbo

Here is a more readable version that consumes the vector:

这是一个更易读的使用向量的版本:

use std::iter::FromIterator;

fn main() {
    let v = vec!['a', 'b', 'c', 'd'];
    let s = String::from_iter(v);
    // vs
    let s: String = v.into_iter().collect();
}

Note that collectis implemented with a call to FromIterator::from_iter:

请注意,这collect是通过调用实现的FromIterator::from_iter

fn collect<B: FromIterator<Self::Item>>(self) -> B
where
    Self: Sized,
{
    FromIterator::from_iter(self)
}