What is the trim function in Rust?

Different `trim()` functions

trim_start() returns the string slice after removing the leading whitespace.

trim_end() returns the string slice after removing the trailing whitespace.

Note: The two functions, trim_left() and trim_right() were previously used to remove leading and trailing whitespaces, but have been superseded with trim_start() and trim_end() respectively.

trim_matches() returns the string slice after removing the prefixes and suffixes that repeatedly match some pattern.

The pattern can be a single char, chars slice, a function, or a closureused to determine whether the character matches or not.

//DoubleEndedSearcher
pub fn trim_matches<'a, P>(&'a self, pat: P) -> &'a str
where
    P: Pattern<'a>,
    <P as Pattern<'a>>::Searcher: DoubleEndedSearcher<'a>,

trim_start_matches() returns the string slice after removing all the prefixes that repeatedly match some pattern.

trim_end_matches() returns the string slice after removing all the suffixes that repeatedly match some pattern.


fn main() {
    let test = "  1Rust program1  ";
    
    println!("INITIALLY STRING LENGTH IS, {}", test.len());  
    println!("{:?}", test); //debug placeholder
    println!(); 
//trim() 
    println!("After trim(), string length is {}", test.trim().len());
    println!("{:?}", test.trim());
    println!(); 
//trim_start() 
    println!("After trim_start(), string length is {}", test.trim_start().len());
    println!("{:?}", test.trim_start());
    println!(); 
//trim_end()
    println!("After trim_end(), string length is {}", test.trim_end().len());
    println!("{:?}", test.trim_end());
    println!(); 
//trim_end_matches()
    println!("With trim_end_matches(), string 23Rust program23 becomes");
    println!("{:?}", "23Rust program23".trim_end_matches("23")); 
    println!(); 
//trim_start_matches()
    println!("With trim_start_matches(), string 23Rust program23 becomes");
    println!("{:?}", "23Rust program23".trim_start_matches("23")); 
    println!(); 
}

Free AI Mock Interviews

Coding Interview

Coding PatternsFree Interview

Gain insights and practical experience with coding patterns through targeted MCQs and coding problems, designed to match and challenge your expertise level.

System Design

You TubeFree Interview

Learn to design a video streaming platform like YouTube by tackling functional and non-functional requirements, core components, and high-level to detailed design challenges.

Free Resources

What is the trim function in Rust?

Different trim() functions

Code example

Different `trim()` functions