Rust: How to Create and Manage Dynamic Arrays?

In Rust, dynamic arrays are typically implemented using the Vec<T> type, where T represents the type of elements in the array. Vec<T> is a growable array that can dynamically adjust its capacity.

The following are the basic steps to create and manage dynamic arrays:

1. Create a new dynamic array:

   rust
   let mut vec = Vec::new(); // Initialize an empty dynamic array

   Or, if you know the elements in the array:

   rust
   let vec = vec![1, 2, 3, 4, 5]; // Create and initialize the array using a macro

2. Add elements to the dynamic array:

   rust
   vec.push(6); // Append an element to the end of the array

3. Read elements from the dynamic array: Access elements by index, ensuring the index is within bounds to avoid causing a panic:

   rust
   if let Some(value) = vec.get(0) { // Safely access the element at index 0
       println!("The first element is {}", value);
   } else {
       println!("No element at index 0");
   }

4. Remove elements from the dynamic array:

   rust
   let last_element = vec.pop(); // Remove and return the last element of the array
   if let Some(value) = last_element {
       println!("Popped element: {}", value);
   }

5. Iterate over elements in the dynamic array:

   rust
   for elem in &vec { // Iterate over each element in the array
       println!("{}", elem);
   }

6. Adjust the size of the array: Use the resize method to change the array size and specify a default value for new elements:

   rust
   vec.resize(10, 0); // Resize the array to 10 elements, initializing new elements to 0

The above steps demonstrate how to effectively use and manage dynamic arrays in Rust. Vec<T> provides various methods to support dynamic modification and access of arrays, making it the preferred way to handle dynamic arrays.