Which one should i use in rust trim() or trim_end

Question

let user_guessed = user_guessed.trim()
// Or
let user_guessed = user_guessed.trim_end()

Which one is better?

Answer 1

How to know which one contain white space, beginning input or end of input

Answer 2

The methods' name kinda explain what they do. trim() strips whitespace from beginning & end of string. trim_end() only strips whitespace from end of string.

It's not about which one is better, it's more about necessity. Whether input may (or not) contain whitespace in the beginning and/or end of string.

Answer 3

Don't know Rust, but maybe you can check by passing each character in the beginning of the string to is_whitespace()

https://doc.rust-lang.org/std/primitive.char.html#method.is_whitespace

https://doc.rust-lang.org/src/core/char/methods.rs.html#809