How to check if a character is uppercase in Rust

Overview

We use the is_uppercase() method to check if a character is uppercase in Rust.

Syntax

character.is_uppercase()
Syntax for the uppercase() method

Parameters

character: This is a single character whose case we want to check.

Return value

It returns a Boolean value: true or false. If the character is uppercase indeed, it returns true. Otherwise, it returns false.

Code example

fn main(){
// Creating some characters
let char1 = 'E';
let char2 = 'c';
let char3 = 'X';
let char4 = 'r';
let char5 = '6';
// Checking if the characters are uppercase
println!("{}", char1.is_uppercase());
println!("{}", char2.is_uppercase());
println!("{}", char3.is_uppercase());
println!("{}", char4.is_uppercase());
println!("{}", char5.is_uppercase());
}

Code explanation

  • Line 3–7: We introduce five characters.
  • Line 10–14: We use the is_uppercase() method on each character to check whether it is uppercase.

Free Resources