# What is Swift?

Swift is a high-performance system programming language. It has a clean and modern syntax, offers seamless access to existing C and Objective-C code and frameworks, and is memory safe by default.

Although inspired by Objective-C and many other languages, Swift is not itself a C-derived language. As a complete and independent language, Swift packages core features like flow control, data structures, and functions, with high-level constructs like objects, protocols, closures, and generics. Swift embraces modules, eliminating the need for headers and the code duplication they entail.

To learn more about the programming language, visit [swift.org](https://swift.org).

> [swift.org](https://swift.org/about/)  
> [Swift on Github](https://github.com/apple/swift)

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# How to use this image

##### Start a REPL

Swift requires [a little bit of extra security privilege](https://github.com/apple/swift-docker/issues/9#issuecomment-272527182) to run the REPL. The following command creates an ephemeral container, attaches your terminal to it and starts the Swift REPL. A great way to try out pre-release builds!

```bash
docker run --cap-add sys_ptrace -it --rm %%IMAGE%% swift
```

##### Pull the Docker Image From Docker Hub:

```bash
docker pull %%IMAGE%%
```

##### Create a Container from the Image and Attach It:

```bash
docker run  -it --name swiftfun %%IMAGE%% /bin/bash
```

##### To Start and Attach Your Image Later:

Start your image with name `swiftfun`

```bash
docker start swiftfun
```

and then attach it

```bash
docker attach swiftfun
```