Web Reference: A vector containing the elements 'a' and 'b' with capacity 4 can be visualized as below. The top part is the Vec struct, it contains a pointer to the head of the allocation in the heap, length and capacity. The bottom part is the allocation on the heap, a contiguous memory block. Rust vectors are designed to grow and shrink at the end, but you can also add or remove elements at the beginning or at a specified index. Use insert() to add an item at a specified index: Vec, commonly referred to as a “vector,” is Rust’s primary dynamic array type. The Vec struct itself is a small object on the stack containing a pointer to its heap-allocated data, a length, and a capacity.
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