Question 1

Which method allows adding an element to the end of a Vec<T>?

Accepted Answer

The push() method adds an element to the end of the vector, increasing its size by 1. This operation has amortized O(1) complexity because the vector may need to reallocate memory if capacity is exceeded. To add multiple elements, extend() or append() can be used depending on the needs.

Question 2

What is the main difference between String and &str in Rust?

Accepted Answer

String is an owned type stored on the heap, mutable and resizable. &str is an immutable reference to a UTF-8 sequence, often called a 'string slice'. String owns its data and can be modified, while &str borrows existing data without owning it. This distinction is fundamental for memory management in Rust.

Question 3

How to create a new empty Vec<i32> in Rust?

Accepted Answer

Vec::new() creates an empty vector without initial allocation. The vec![] macro can also create an empty vector, but Vec::new() is the standard explicit method. The generic type can be inferred or explicitly specified with turbofish syntax Vec::<i32>::new() or by type annotation.

Collections

Which method allows adding an element to the end of a Vec<T>?

Resposta

What is the main difference between String and &str in Rust?

Resposta

How to create a new empty Vec<i32> in Rust?

Resposta

What does the get() method return on a Vec<T>?

Which data structure to use for associating keys with values with O(1) average access?

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