---
title: Code Organization
slug: code-organization
---

When a single code block is getting larger, it should be decomposed into smaller pieces and should be organized in a proper manner. Rust supports different levels of code organization.

## 1. Functions

## 2. Modules

Can be mapped to a,
  - **Inline module**
  - **File** 
  - **Directory hierarchy**
  
## 3. Crates

Can be mapped to a, 
  - **lib.rs file on the same executable crate**
  - **Dependency crate specified on Cargo.toml**
    
    Can be specified from,
      - **Path**
      - **Git repository**
      - **crates.io**
    
## 4. Workspaces

Helps to manage multiple crates as a single project.


Let’s discuss one by one.

> 💡 To make examples more simpler, we use a simple function which prints `“Hello, world!”`. But regarding writing testable codes, always try to return the `String` from the function and print it when calling it, instead of printing the `String` inside the function.