How to check if a character is white space in Rust

Overview

A white space character is any character or characters that represent horizontal or vertical space in typography. In Rust, we can check if a character is white space using the is_whitespace() method.

Syntax

character.is_whitespace()
Syntax of the is_whitespace() method

Parameter value

character: This is the character we want to check to see if it is a white space.

Return value

The is_whitespace() method returns a Boolean value. If the character is a white space, then the method returns true. Otherwise, it returns false.

Example

fn main(){
  // create some characters
  let char1 = 'E';
  let char2 = '\u{A0}';   // no-break space
  let char3 = '\n';       // new line
  let char4 = 'r';
  let char5 = '\u{202F}'; // narrow no-break space 
  // check if characters are white-space
  println!("{}", char1.is_whitespace());  // false
  println!("{}", char2.is_whitespace());  // true
  println!("{}", char3.is_whitespace());  // true
  println!("{}", char4.is_whitespace());  // false
  println!("{}", char5.is_whitespace());  // true
}

Explanation

  • Lines 3–7: We create some characters, some of which are white space.
  • Lines 10–14: We check the characters we created to see if they are white space. Then, we print the results to the console.

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