How to Remove Duplicates in a Vector in Rust

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,

  1. We start by importing the std::collections::HashSet to use the HashSet collection type.
  2. We then create a vector named vec with some integer values, including duplicates.
  3. Next, we create a HashSet from the vector to filter out all duplicate elements. A HashSet only keeps unique elements.
  4. 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.
  5. 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,

  1. We start by creating a mutable vector named vec with some integer values, including consecutive duplicates.
  2. We then use the dedup method on vec. This method removes consecutive duplicate elements from the vector, modifying it in place.
  3. The dedup method does not require any arguments and returns ().
  4. 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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  2. How to Initialize a Vector in Rust ?
  3. How to Get Length of a Vector in Rust ?
  4. How to create a Vector of Size N in Rust ?
  5. How to create a Vector of Numbers from 1 to N in Rust ?
  6. How to create a Vector of Integers in Rust ?
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  8. How to create a Vector of Empty Vectors in Rust ?
  9. How to Access Items in a Vector in Rust ?
  10. How to get Item in a Vector at a Specific Index in Rust ?
  11. How to get First Item in a Vector in Rust ?
  12. How to get Last Item in a Vector in Rust ?
  13. How to Iterate Over a Vector in Rust ?
  14. How to Iterate Over a Vector with Index in Rust ?
  15. How to Iterate Over a Vector in Reverse Order in Rust ?
  16. How to check if a Vector is Empty in Rust ?
  17. How to check if a Vector is Not Empty in Rust ?
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  19. How to get the Index of Specified Item in a Vector in Rust ?
  20. How to check if a Specific Item is present in the Vector in Rust ?
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  22. How to count the Number of Occurrences of Specific Item in the Vector in Rust ?
  23. How to find the Item with Maximum Number of Occurrences in a Vector in Rust ?
  24. How to find the Item with Minimum Number of Occurrences in a Vector in Rust ?
  25. How to Sort a Vector in Rust ?
  26. How to Sort a Vector in Ascending Order in Rust ?
  27. How to Sort a Vector in Descending Order in Rust ?
  28. How to create a Two Dimensional Vector in Rust ?
  29. How to Iterate over a Two Dimensional Vector in Rust ?
  30. How to create a Three Dimensional Vector in Rust ?
  31. How to Copy a Vector in Rust ?
  32. How to Split a Vector in Rust ?
  33. How to Join Vectors in Rust ?
  34. How to Append an Item to a Vector in Rust ?
  35. How to Insert an Item at Specific Index in a Vector in Rust ?
  36. How to Append a Vector to another Vector in Rust ?
  37. How to Concatenate Two Vectors in Rust ?
  38. How to check if Two Vectors are Equal in Rust ?
  39. How to check if Two Vectors have Same Items (Regardless of Order) in Rust ?
  40. How to Convert a Vector of Integers to a Vector of Strings in Rust ?
  41. How to Convert a Vector of Strings to a Vector of Integers in Rust ?
  42. How to Convert a Vector of Floats to a Vector of Strings in Rust ?
  43. How to Convert a Vector of Strings to a Vector of Floats in Rust ?
  44. How to Reverse a Vector in Rust ?
  45. How to Shuffle a Vector in Rust ?
  46. How to Slice a Vector in Rust ?
  47. How to get First N Items from a Vector in Rust ?
  48. How to get Last N Items from a Vector in Rust ?
  49. How to Rotate Items in a Vector in Rust ?
  50. How to Filter Items of a Vector based on a Condition in Rust ?
  51. How to Remove Duplicates in a Vector in Rust ?
  52. How to Remove Item at a Specific Index from a Vector in Rust ?
  53. How to Remove Specific Item from a Vector in Rust ?
  54. How to Remove Items from Vector based on a Condition in Rust ?
  55. How to Sort a String Vector in Dictionary Order in Rust ?
  56. How to Concatenate Strings in Vector in Rust ?
  57. How to create a Vector of Vectors in Rust ?