How to Get Length of a Vector in Rust - Step by Step Examples

How to Get Length of a Vector in Rust ?

Answer

To get the length of a vector in Rust, you can use the len method of the Vec class.


✐ Examples

1 Get Length of a Numeric Vector

In this example,

  1. We start by importing the std::vec::Vec module, although it's included in the prelude and doesn't need to be explicitly imported.
  2. We create a vector named num_vector with a set of numeric values using the vec![] macro, which allows us to easily define vectors.
  3. We call the len method on num_vector to get the number of elements in the vector. The len method returns the length of the vector as a usize value.
  4. We assign the result of the len method to a variable named num_vector_length.
  5. Finally, we print the length of the vector using the println! macro to display the value of num_vector_length on the console.

Rust Program

fn main() {
    let num_vector = vec![10, 20, 30, 40, 50];
    let num_vector_length = num_vector.len();
    println!("Length of numeric vector: {}", num_vector_length);
}

Output

Length of numeric vector: 5

2 Get Length of a String Vector

In this example,

  1. We start by importing the std::vec::Vec module, although it's included in the prelude and doesn't need to be explicitly imported.
  2. We create a vector named str_vector with a set of string values using the vec![] macro. Each string value is defined using the String::from function to convert string literals into String objects.
  3. We call the len method on str_vector to get the number of elements in the vector. The len method returns the length of the vector as a usize value.
  4. We assign the result of the len method to a variable named str_vector_length.
  5. Finally, we print the length of the vector using the println! macro to display the value of str_vector_length on the console.

Rust Program

fn main() {
    let str_vector = vec![String::from("apple"), String::from("banana"), String::from("cherry")];
    let str_vector_length = str_vector.len();
    println!("Length of string vector: {}", str_vector_length);
}

Output

Length of string vector: 3

Summary

In this tutorial, we learned How to Get Length of 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 ?