How to Remove Duplicates in a Vector in Rust - Step by Step Examples

How to Remove Duplicates in a Vector in Rust ?

Answer

To remove duplicates from a vector in Rust, you can use the dedup method or create a new vector with unique elements using a HashSet.

✐ Examples

1 Remove All Duplicates from a Vector

In this example,

We start by importing the std::collections::HashSet to use the HashSet collection type.
We then create a vector named vec with some integer values, including duplicates.
Next, we create a HashSet from the vector to filter out all duplicate elements. A HashSet only keeps unique elements.
We then convert the HashSet back to a vector using the into_iter and collect methods. This gives us a new vector containing only the unique elements.
Finally, we print the new vector to standard output to see the result.

Rust Program

use std::collections::HashSet;

fn main() {
    let vec = vec![1, 2, 2, 3, 4, 4, 4, 5, 6, 6];
    let set: HashSet<_> = vec.into_iter().collect();
    let unique_vec: Vec<_> = set.into_iter().collect();
    println!("Vector after removing all duplicates: {:?}", unique_vec);
}

Output

Vector after removing all duplicates: [1, 2, 3, 4, 5, 6]

2 Remove Consecutive Duplicates in a Vector

In this example,

We start by creating a mutable vector named vec with some integer values, including consecutive duplicates.
We then use the dedup method on vec. This method removes consecutive duplicate elements from the vector, modifying it in place.
The dedup method does not require any arguments and returns ().
Finally, we print the modified vector to standard output to see the result.

Rust Program

fn main() {
    let mut vec = vec![1, 2, 2, 3, 4, 4, 4, 5, 6, 6];
    vec.dedup();
    println!("Vector after removing consecutive duplicates: {:?}", vec);
}

Output

Vector after removing consecutive duplicates: [1, 2, 3, 4, 5, 6]

Summary

In this tutorial, we learned How to Remove Duplicates in a Vector in Rust language with well detailed examples.

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How to Remove Duplicates in a Vector in Rust - Step by Step Examples

How to Remove Duplicates in a Vector in Rust ?

Answer

✐ Examples

1 Remove All Duplicates from a Vector

Rust Program

Output

2 Remove Consecutive Duplicates in a Vector

Rust Program

Output

Summary

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