How to Filter Items of a Set based on a Condition in Rust - Step by Step Examples

How to Filter Items of a Set based on a Condition in Rust ?

Answer

To filter items of a set based on a condition in Rust, you can use iterators and closures with the filter method to create a new set from the filtered items.


✐ Examples

1 Filtering Numbers Greater Than 5

In this example,

  1. We create a set named number_set using the hashset! macro from the hashbrown crate, which contains integer values 1, 5, 10, 15, and 20.
  2. We use the iter() method to create an iterator over number_set and chain it with the filter method, which takes a closure as the filtering condition to filter numbers greater than 5.
  3. We collect the filtered items into a new set named filtered_set.
  4. Finally, we iterate through filtered_set and print each filtered item to the console.

Rust Program

use hashbrown::HashSet;

fn main() {
    let number_set = hashset!{1, 5, 10, 15, 20};
    let filtered_set: HashSet<i32> = number_set.iter().filter(|&num| *num > 5).copied().collect();

    for num in &filtered_set {
        println!("{}", num);
    }
}

Output

10
15
20

2 Filtering Strings Containing 'a'

In this example,

  1. We create a set named string_set using the hashset! macro from the hashbrown crate, which contains string values "apple", "banana", "cherry", "date", and "grape".
  2. We use the iter() method to create an iterator over string_set and chain it with the filter method, which takes a closure as the filtering condition to filter strings containing the letter 'a'.
  3. We collect the filtered items into a new set named filtered_string_set.
  4. Finally, we iterate through filtered_string_set and print each filtered string to the console.

Rust Program

use hashbrown::HashSet;

fn main() {
    let string_set = hashset!{"apple", "banana", "cherry", "date", "grape"};
    let filtered_string_set: HashSet<&str> = string_set.iter().filter(|&str| str.contains('a')).copied().collect();

    for str in &filtered_string_set {
        println!("{}", str);
    }
}

Output

apple
banana
grape

Summary

In this tutorial, we learned How to Filter Items of a Set based on a Condition in Rust language with well detailed examples.


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  28. How to Remove Items from Set based on a Condition in Rust ?
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