Rust Tutorials

How to Replace Character at Specific Index in String in Rust

How to Replace Character at Specific Index in String in Rust ?

Answer

To replace a character at a specific index in a string in Rust, you need to convert the string to a mutable byte array and then directly modify the byte at the desired index.

✐ Examples

1 Replace character at specific index in a string

In this example,

We create a string named str.
We convert the string to a mutable byte array using as_bytes_mut().
We replace the character at index index with the byte representation of the character newChar.
Finally, we print the modified string str.

Rust Program

fn main() {
    let mut str = String::from("Hello World");
    let index = 6;
    let new_char = b'x';
    let bytes = str.as_bytes_mut();
    bytes[index] = new_char;
    println!("{}", str);
}

Output

Hello xorld

Summary

In this tutorial, we learned How to Replace Character at Specific Index in String in Rust language with well detailed examples.

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