Rust Programming: Methods for Iterating Over Strings

The best way to iterate over strings in Rust depends on what you want to do with the string. If you want to iterate over the individual characters in the string, you can use the chars() method. This method returns an iterator over the Unicode scalar values in the string.

If you want to iterate over the raw bytes in the string, you can use the bytes() method. This method returns an iterator over the individual bytes in the string.

Be careful when using the bytes() method, as valid Unicode scalar values may be made up of more than 1 byte. If you need to iterate over grapheme clusters, you can use a crate from crates.io, such as unicode-segmentation.

Here are some examples of how to iterate over strings in Rust:

Rust

// Iterate over the individual characters in a string.
let my_string = "Hello, world!";
for c in my_string.chars() {
    println!("{}", c);
}

// Iterate over the raw bytes in a string.
let my_string = "Hello, world!";
for b in my_string.bytes() {
    println!("{}", b);
}

// Iterate over the grapheme clusters in a string.
use unicode_segmentation::UnicodeSegmentation;

let my_string = "नमस्ते दुनिया!";
for grapheme in my_string.graphemes(true) {
    println!("{}", grapheme);
}

Which method you use to iterate over a string depends on what you need to do with the string.