How to get Last Item in a Vector in Rust - Step by Step Examples

How to get Last Item in a Vector in Rust ?

Answer

To get the last item in a vector in Rust, you can use the last method provided by the Vec type.


✐ Examples

1 Get Last Item in a Vector of Integers

In this example,

  1. First, we create a vector named vec with a series of integer values using the vec! macro.
  2. We then call the last method on the vector vec to get an Option that contains the last element of the vector.
  3. The last method returns Some(&T) if the vector is not empty, where &T is a reference to the last element. If the vector is empty, it returns None.
  4. We use a match expression to handle both cases: if last returns Some(&last_item), we print the last item to the console; if it returns None, we print a message indicating that the vector is empty.

Rust Program

fn main() {
    let vec = vec![10, 20, 30, 40, 50];
    match vec.last() {
        Some(&last_item) => println!("The last item is: {}", last_item),
        None => println!("The vector is empty"),
    }
}

Output

The last item is: 50

2 Get Last Item in a Vector of Strings

In this example,

  1. First, we create a vector named vec with a series of string values using the vec! macro.
  2. We then call the last method on the vector vec to get an Option that contains the last element of the vector.
  3. The last method returns Some(&String) if the vector is not empty, where &String is a reference to the last element. If the vector is empty, it returns None.
  4. We use a match expression to handle both cases: if last returns Some(last_item), we print the last item to the console; if it returns None, we print a message indicating that the vector is empty.

Rust Program

fn main() {
    let vec = vec!["apple", "banana", "cherry", "date", "elderberry"];
    match vec.last() {
        Some(last_item) => println!("The last item is: {}", last_item),
        None => println!("The vector is empty"),
    }
}

Output

The last item is: elderberry

Summary

In this tutorial, we learned How to get Last Item in a Vector in Rust language with well detailed examples.


More Rust Vectors Tutorials

  1. How to create an Empty Vector in Rust ?
  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 ?
  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 ?
  18. How to get Sub Vector in Rust ?
  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 ?
  21. How to check if a Vector contains all the items of Another Vector in Rust ?
  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 ?