How to convert Vec to a string

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

0

2 Answers

Use collect() on an iterator:

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():

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

There is no more direct way because char is 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.

2

Here is a more readable version that consumes the vector:

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 collect is implemented with a call to FromIterator::from_iter:

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

1

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