Editing Entry point (section)

===Clean===
[[Clean (programming language)|Clean]] is a functional programming language based on graph rewriting. The initial node is named <code>Start</code> and is of type <code>*World -> *World</code> if it ''changes'' the world or some fixed type if the program only prints the result after [[graph rewriting|reducing]] <code>Start</code>.

<syntaxhighlight lang="clean">
Start :: *World -> *World
Start world = startIO ...
</syntaxhighlight>

Or even simpler

<syntaxhighlight lang="clean">
Start :: String
Start = "Hello, world!"
</syntaxhighlight>

One tells the compiler which option to use to generate the executable file.