How to convert Vec to a string

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

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.

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) }