What is string.is_ascii() in Rust?
Overview
The is_ascii() method in Rust is used to check if the characters of a particular string are ASCII or within the ASCII range. If at least one of the characters is not ASCII, then a Boolean false is returned. Otherwise, a true is returned.
A character is said to be ASCII if it is a number from 0 to 9, a letter from A to Z, or a special character.
Syntax
string.is_ascii()
Syntax to check if a string is ASCII
Parameters
string: This is the string we are checking to see if it is an ASCII.
Return value
The value returned is a boolean. If all the characters of the string are ASCII, a true is returned. Otherwise, false is returned.
Code example
fn main(){// create some stringslet str1 = "Edpresso is the best";let str2 = "I love ❤ Educative.io"; // non ASCIIlet str3 = "I shine like a star ☀"; // non ASCIIlet str4 = "Rust is the best!";let str5 = "Coding is fun";// check if stracters are asciiprintln!("'{}' is ASCII? {}", str1, str1.is_ascii()); // trueprintln!("'{}' is ASCII? {}", str2, str2.is_ascii()); // falseprintln!("'{}' is ASCII? {}", str3, str3.is_ascii()); // falseprintln!("'{}' is ASCII? {}", str4, str4.is_ascii()); // trueprintln!("'{}' is ASCII? {}", str5, str5.is_ascii()); // true}
Code explanation
- Lines 3–7: We create some strings, out of which a few are ASCII while the others are not.
- Lines 10–14: We check if the strings are ASCII using the
is_ascii()method and then print the result to the console screen.
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