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< img width = "1412" src = "https://cdn.aleo.org/leo/banner.png" >
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< h1 align = "center" > The Leo Programming Language< / h1 >
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< / p >
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Leo is a functional, statically-typed programming language built for writing private applications.
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## <a name='TableofContents'></a>Table of Contents
* [1. Overview ](#1-overview )
* [2. Build Guide ](#2-build-guide )
* [2.1 Install Rust ](#21-install-rust )
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* [2.2 Build from Source Code ](#22-build-from-source-code )
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* [3. Quick Start ](#3-quick-start )
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* [4. Documentation ](#4-documentation )
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* [5. Contributing ](#5-contributing )
* [6. License ](#6-license )
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## 1. Overview
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Welcome to the Leo programming language.
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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.
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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.
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Leo is one part of a greater ecosystem for building private applications on [Aleo ](https://aleo.org/ ).
The language is currently in an alpha stage and is subject to breaking changes.
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## 2. Build Guide
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### 2.1 Install Rust
We recommend installing Rust using [rustup ](https://www.rustup.rs/ ). You can install `rustup` as follows:
- macOS or Linux:
```bash
curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
```
- Windows (64-bit):
Download the [Windows 64-bit executable ](https://win.rustup.rs/x86_64 ) and follow the on-screen instructions.
- Windows (32-bit):
Download the [Windows 32-bit executable ](https://win.rustup.rs/i686 ) and follow the on-screen instructions.
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### 2.2 Build from Source Code
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We recommend installing Leo by building from the source code as follows:
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```bash
# Download the source code
git clone https://github.com/AleoHQ/leo
cd leo
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# Install 'leo'
$ cargo install --path .
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```
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Now to use leo, in your terminal, run:
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```bash
leo
```
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## 3. Quick Start
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Use the Leo CLI to create a new project
```bash
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# create a new `hello-world` Leo project
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leo new helloworld
cd helloworld
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# build & setup & prove & verify
leo run
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```
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The `leo new` command creates a new Leo project with a given name.
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The `leo run` command will compile the program into Aleo instructions and run it.
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Congratulations! You've just run your first Leo program.
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## 4. Documentation
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* [Hello World - Next Steps ](https://developer.aleo.org/leo/getting_started/hello_world )
* [Leo Language Documentation ](https://developer.aleo.org/leo/getting_started/overview )
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* [Leo ABNF Grammar ](./docs/grammar/abnf-grammar.txt )
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* [Homepage ](https://developer.aleo.org/overview/ )
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## 5. Contributing
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Please see our guidelines in the [developer documentation ](./CONTRIBUTING.md )
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Thank you for helping make Leo better!
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## 6. License
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[![License: GPL v3 ](https://img.shields.io/badge/License-GPLv3-blue.svg )](./LICENSE.md)