Getting Started

Usage

Below is a basic Pure script and its execution:

using static System.Console;

var sum = File.ReadLines("Data.csv")
    .Skip(1)
    .Select(l => l.Split(','))
    .Sum(parts => double.Parse(parts[1]));
WriteLine(sum);

REPL

The REPL mode simplifies certain syntax to make it easier when evaluating things quickly on the command line:

1. Supports Help() and Help(keyword) commands
2. Supports meta commands (e.g. :packages)
3. Provides Print (maps to Console.WriteLine())
4. Exposes Console, Math at global level

Basic Syntax

Certain macros/syntax are provided to implement language level scripting constructs:

Macro/Syntax	Function	Remark	Examples
Import()	Import modules from PATH, and automatically download packages from NuGet	Must be on its own line	Import(MODULE) Import(MODULE, true) Import(MODULE as Assembly.dll) Import(MODULE as Assembly.dll, true)
Include()	Transclude scripts from file path	Must be on its own line; At the moment it's only safe to include from the top-level, one must assume we cannot have another include within included files, otherwise the behavior might be undeterministic, see issue
Help(name)	Get help about namespaces, types, and specific variables

Expresison evaluation

For single line assignment and variable creation, no need to append ; at end of line - this is only applicable at REPL; For script files, it must be properly formatted.

Installation & Source Build (Only if you have access to source code)

This section applies to earlier version and modern version of Pure.

The source code can be built on Windows/Linux with .Net 8 SDK.

• To use on Windows, just download prebuilt executables from Release.
• To build on Linux, either try PublishAll.ps1 (require pwsh), or just do dotnet publish Frontends/Pure/Pure.csproj --use-current-runtime --output Publish.