How to get First N Items from a Vector in Rust


How to get First N Items from a Vector in Rust ?

Answer

To get the first N items from a vector in Rust, you can use array slicing.



✐ Examples

1 Get First N Items from Vector

In this example,

  1. First, you define a vector containing the elements from which you want to retrieve the first N items.
  2. Next, you specify the range for the first N items using array slicing. Rust uses zero-based indexing, so to select the first N items, you use the range from 0 to N-1.
  3. Finally, you retrieve the elements using the specified range.

Rust Program

fn main() {
    // Define a vector containing elements
    let vector = vec![1, 2, 3, 4, 5, 6, 7, 8, 9, 10];

    // Specify the number of items to retrieve (N)
    let n = 5;

    // Retrieve the first N items from the vector
    let first_n_items = &vector[0..n];

    // Print the first N items
    println!("{:?}", first_n_items);
}

Output

[1, 2, 3, 4, 5]

2 Get First Three Items from String Vector

In this example,

  1. Define a vector containing strings.
  2. Specify the range from 0 to 2 to retrieve the first three items from the string vector.
  3. Retrieve the first three items using array slicing.

Rust Program

fn main() {
    // Define a vector containing strings
    let string_vector = vec!["apple", "banana", "orange", "grape", "kiwi"];

    // Specify the range to retrieve the first three items
    let range = 0..3;

    // Retrieve the first three items from the string vector
    let first_three_items = &string_vector[range];

    // Print the first three items
    println!("{:?}", first_three_items);
}

Output

["apple", "banana", "orange"]

Summary

In this tutorial, we learned How to get First N Items from 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 ?
  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 ?
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  13. How to Iterate Over a Vector in Rust ?
  14. How to Iterate Over a Vector with Index in Rust ?
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  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 ?
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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 ?