How do I convert a single character String to a char?

One solution is to use chars method. This return an iterator over the chars of a string slice.

let letter_as_char: char = letter.chars().next().unwrap(); println!("{:?}", letter_as_char); 

But it is important to remember that

char represents a Unicode Scalar Value, and might not match your idea of what a ‘character’ is. Iteration over grapheme clusters may be what you actually want. For example, Consider the String H

let y = "H"; let mut chars = y.chars(); assert_eq!(Some('H'), chars.next()); assert_eq!(None, chars.next()); 

Now consider "y̆"

let y = "y̆"; let mut chars = y.chars(); assert_eq!(Some('y'), chars.next()); // not 'y̆' assert_eq!(Some('\u{0306}'), chars.next()); assert_eq!(None, chars.next()); 

See also:

• How to iterate over Unicode grapheme clusters in Rust?