How to Iterate Over a Vector in Reverse Order in Rust

How to Iterate Over a Vector in Reverse Order in Rust ?

Answer

To iterate over a vector in reverse order in Rust, you can use the .iter().rev() method, which provides an iterator yielding references to the elements of the vector in reverse order.


✐ Examples

1 Iterate Over a Numeric Vector in Reverse Order

In this example,

  1. We create a vector named num_vec containing several numeric values.
  2. We use the iter().rev() method to obtain a reverse iterator over the elements of num_vec.
  3. We then iterate over the reverse iterator using a for loop, which allows us to access each element of the vector in reverse order.
  4. Inside the loop, we print each element, effectively traversing the vector in reverse order.

Rust Program

fn main() {
    let num_vec = vec![10, 20, 30, 40, 50];
    for num in num_vec.iter().rev() {
        println!("{}", num);
    }
}

Output

50
40
30
20
10

2 Iterate Over a String Vector in Reverse Order

In this example,

  1. We create a vector named str_vec containing several string values.
  2. We use the iter().rev() method to obtain a reverse iterator over the elements of str_vec.
  3. We then iterate over the reverse iterator using a for loop, allowing us to access each string element of the vector in reverse order.
  4. Inside the loop, we print each string, effectively traversing the vector in reverse order.

Rust Program

fn main() {
    let str_vec = vec!["apple", "banana", "cherry", "date"];
    for s in str_vec.iter().rev() {
        println!("{}", s);
    }
}

Output

date
cherry
banana
apple

Summary

In this tutorial, we learned How to Iterate Over a Vector in Reverse Order 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 ?
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  5. How to create a Vector of Numbers from 1 to N in Rust ?
  6. How to create a Vector of Integers in Rust ?
  7. How to create a Vector of Strings in Rust ?
  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 ?
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  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 ?
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  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 ?
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  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 ?