How to concatenate a Strings in Rust example

In this example, You’ll find multiple ways to concatenate a string in rust with examples.

For example, suppose you have two strings declared in Rust.

    let first = "First";
    let second = "Second";

After appending the strings, the result is First Second.

#How to Append a String in Rust

There are multiple methods we can use to concatenate strings in Rust:

• use join method

  The join function concatenates strings with a specified separator string. The separator can be a space, tab (\t), or a newline (\n).

  fn main() {
      let first = "First";
      let second = "Second";
      let output = [first, second].join(" ");
      print!("{}", output);
  }
  

  Output:

  First Second
  

• use format macro

  The format function macro formats the string with interpolation syntax. It contains {} syntax with variables separated by commas. Variables are replaced {} and output as a string.

  fn main() {
      let first = "First";
      let second = "Second";
      let output = format!("{} {}", first, second);
      print!("{}", output);
  }
  
  

  Output:

  First Second
  

• use concat macro The concat macro converts multiple strings into a single string. It accepts comma-separated strings of type &'static str.

  fn main() {
      let output = concat!("First", " ", "Second");
      print!("{}", output);
  }
  

  Output:

  First Second
  

• Using the push_str Method The push_str method appends a string to the original string. The original string is modified and declared with the mut keyword.

  Here is an example program for push_str append strings

  fn main() {
      let mut first = "First".to_string();
      let second = "Second".to_string();
      first.push_str(&second);
      println!("{}", first);
  }
  

  Output:

  FirstSecond
  

• use + operator

  The + operator concatenates two strings and assigns the result to a new variable. The original string is not modified, so mut is not required.

  fn main() {
      let first = "First".to_string();
      let second = "Second".to_string();
      let result = first + &second;
      println!("{}", result);
  }
  

  Output:

  FirstSecond
  

#Conclusion

In conclusion, we’ve learned multiple ways to concatenate strings in Rust with examples.