[](#contributors-)

The Leo Programming Language

Leo is a functional, statically-typed programming language built for writing private applications.

Table of Contents

• 1. Overview 🍎
• 2. Build Guide ⚙️️
  • 2.1 Install Rust 🦀
  • 2.2 Build from Source Code 🐙
• 3. Quick Start 🚀
• 4. Troubleshooting 🧰
• 5. Documentation 📖
• 6. Contributing 🤝
• 7. Contributors ❤️
• 8. License 🛡️

1. Overview 🍎

Welcome to the Leo programming language.

Leo provides a high-level language that abstracts low-level cryptographic concepts and makes it easy to integrate private applications into your stack. Leo compiles to circuits making zero-knowledge proofs practical.

The syntax of Leo is influenced by traditional programming languages like JavaScript, Scala, and Rust, with a strong emphasis on readability and ease-of-use. Leo offers developers with tools to sanity check circuits including unit tests, integration tests, and console functions.

Leo is one part of a greater ecosystem for building private applications on Aleo. The language is currently in an alpha stage and is subject to breaking changes.

2. Build Guide ⚙️️

2.1 Install Rust 🦀

We recommend installing Rust using rustup. You can install rustup as follows:

• macOS or Linux:

  curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
  

• Windows (64-bit):

  Download the Windows 64-bit executable and follow the on-screen instructions.

• Windows (32-bit):

  Download the Windows 32-bit executable and follow the on-screen instructions.

2.2 Build from Source Code 🐙

We recommend installing Leo by building from the source code as follows:

# Download the source code
git clone https://github.com/AleoHQ/leo
cd leo

# Install 'leo'
$ cargo install --path .

Now to use leo, in your terminal, run:

leo

3. Quick Start 🚀

Use the Leo CLI to create a new project

# create a new `hello-world` Leo project
leo new helloworld
cd helloworld

# build & setup & prove & verify
leo run

The leo new command creates a new Leo project with a given name.

The leo run command will compile the program into Aleo instructions and run it.

Congratulations! You've just run your first Leo program.

4. Troubleshooting 🧰

If you are having trouble installing and using Leo, please check out our guide.

If the issue still persists, please open an issue.

5. Documentation 📖

• Hello World - Next Steps
• Leo Language Documentation
• Leo ABNF Grammar
• Homepage

6. Contributing 🤝

Please see our guidelines in the developer documentation

7. Contributors ❤️

Thank you for helping make Leo better!
What do the emojis mean?🧐

d0cd 💻 🚧 💬 👀	Collin Chin 💻 📖 🚧 👀	Howard Wu 🤔 🚧 🔬 👀	Alessandro Coglio 📖 🔬 💬 👀	Eric McCarthy 📖 🔬 💬 👀	Raymond Chu 🤔 💻 🔬	ljedrz 🐛 💻 💬
Mazdak Farrokhzad 💻	Damir Shamanaev 💻	gluax 💻	0rphon 💻	Max Bruce 💻	Sergey Isaev 💻	Francisco Strambini 💻
François Garillot 💻	Weikeng Chen 🔬	sptg 🐛 💻	LouisWT 💻	yuliyu123 💻	detailyang 💻	Tom-OriginStorage 💻
omahs 💻	Haruka 🐛 💻	swift-mx 💻	allcontributors[bot] 📖	actions-user[bot] 📖	Dependabot 💻
Add your contributions

8. License 🛡️