How to Convert a Set of Strings to a Set of Integers in Rust

How to Convert a Set of Strings to a Set of Integers in Rust ?

Answer

In Rust, you can convert a set of strings to a set of integers using the parse() method.


✐ Examples

1 Convert a Set of Strings to a Set of Integers using parse() Method

In this example,

  1. We have a set named string_set1 containing the elements '1', '2', '3', '4', '5'.
  2. We iterate through each element in string_set1.
  3. For each element, we use the parse() method to convert the string to an integer and add it to int_set1.
  4. We print the resulting int_set1 to the console.

Rust Program

use std::collections::HashSet;

fn main() {
    let string_set1: HashSet<&str> = ["1", "2", "3", "4", "5"].iter().cloned().collect();
    let mut int_set1 = HashSet::new();
    for str in string_set1.iter() {
        if let Ok(num) = str.parse::<i32>() {
            int_set1.insert(num);
        }
    }
    for num in int_set1.iter() {
        println!("{}", num);
    }
}

Output

1
2
3
4
5

2 Convert a Set of Strings to a Set of Integers using FromStr Trait

In this example,

  1. We have a set named string_set2 containing the elements '10', '20', '30', '40', '50'.
  2. We iterate through each element in string_set2.
  3. For each element, we use the from_str() method of the FromStr trait to convert the string to an integer and add it to int_set2.
  4. We print the resulting int_set2 to the console.

Rust Program

use std::collections::HashSet;
use std::str::FromStr;

fn main() {
    let string_set2: HashSet<&str> = ["10", "20", "30", "40", "50"].iter().cloned().collect();
    let mut int_set2 = HashSet::new();
    for str in string_set2.iter() {
        if let Ok(num) = i32::from_str(str) {
            int_set2.insert(num);
        }
    }
    for num in int_set2.iter() {
        println!("{}", num);
    }
}

Output

10
20
30
40
50

Summary

In this tutorial, we learned How to Convert a Set of Strings to a Set of Integers in Rust language with well detailed examples.


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