Question 1

By default, how are variables declared in Rust?

Accepted Answer

In Rust, all variables are immutable by default when declared with let. This design promotes safety and concurrency by preventing accidental modifications. To make a variable mutable, explicitly use the mut keyword after let.

Question 2

What is the difference between let and const in Rust?

Accepted Answer

const declares a compile-time constant with mandatory type annotation, while let declares a runtime variable with possible type inference. Constants must have values known at compile time and can be used in compilation contexts like array sizes.

Question 3

What is shadowing in Rust?

Accepted Answer

Shadowing allows redeclaring a variable with the same name using let, creating a new variable that hides the previous one. Unlike mut, shadowing allows changing the variable type. This is useful for transforming a value while keeping the same logical name.

Rust Basics

By default, how are variables declared in Rust?

Câu trả lời

What is the difference between let and const in Rust?

Câu trả lời

What is shadowing in Rust?

Câu trả lời

What is the default signed integer type in Rust?

What is the difference between isize and i64 in Rust?

Các chủ đề phỏng vấn Rust khác

Ownership & Borrowing

Structs & Enums

Error Handling

Collections

Modules & Packages

Traits

Generics

Lifetimes

Iterators & Closures

Smart Pointers

Concurrency Basics

async/await

Testing

Cargo & Ecosystem

Pattern Matching

Macros

Serde & Serialization

Unsafe Rust

Advanced Traits

Advanced Lifetimes

Type System

Tokio & Async I/O

Performance Optimization

Memory Management

Web Frameworks

Database Integration

Rust Design Patterns

Nắm vững Rust cho lần phỏng vấn tiếp theo