In Rust, there are 3 ways to iterate over a string by character. Using chars Method The chars() method returns an iterator over the chars of a string slice. See the following example: fn main() { let s = "abc"; for c in s.chars() { pr...

In Rust, there are 3 ways to update a value in a mutable HashMap. Using get_mut Method The get_mut() method returns a mutable reference to the value corresponding to the key. See the following example: use std::collections::HashMap; fn main()...

In Rust, there are 2 ways to check if key exists in HashMap. Using HashMap::contains_key Method The contains_key method return true if the map contains a value for the specified key. use std::collections::HashMap; fn main() { let mut map = Hash...