Rust Series01 - Ownership is what you need to know

Source: Dev.to

Introduction

Hi fellows, I’ve been using Rust for about three years now, and I think it’s time to share some of my experience. This post kicks off a Rust language learning series that will continue over the next few weeks. Without further ado, let’s dive in.

Ownership in Rust

If you’re familiar with OOP languages like Java or C#, you know that everything revolves around objects. Rust, however, is not an OOP language; it is centered on ownership. Rust asks you explicitly: who owns a piece of memory?

Ownership answers the fundamental question:

Who is responsible for freeing this memory?

Core Ownership Rule (Only One Owner)

• Every value in Rust has exactly one owner at any given time.

let s = String::from("hello");

• s owns the heap memory for "hello".
• When s goes out of scope, the memory is freed automatically.