How to find the Characters in the First String that are not Present in the Second String in Rust - Step by Step Examples

How to find the Characters in the First String that are not Present in the Second String in Rust ?

Answer

To find the characters in the first string that are not present in the second string in Rust, you can use sets and iterators.

✐ Examples

1 Find Characters Not Present in Second String

In this example,

We create two string variables named str1 and str2 with different values.
We convert both strings to sets of characters using the HashSet type from the std::collections module.
We use the difference method on the sets to find characters not present in the second set.
Finally, we convert the resulting set to a string to show characters not present in the second string.

Rust Program

// Find Characters Not Present in Second String
use std::collections::HashSet;
fn main() {
    let str1 = String::from("Hello World");
    let str2 = String::from("apple");
    let set1: HashSet<char> = str1.chars().collect();
    let set2: HashSet<char> = str2.chars().collect();
    let diff: HashSet<_> = set1.difference(&set2).copied().collect();
    let result: String = diff.into_iter().collect();
    println!("Characters not present in second string: {}", result);
}

Output

Characters not present in second string: Ho Word

Summary

In this tutorial, we learned How to find the Characters in the First String that are not Present in the Second String in Rust language with well detailed examples.

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