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=== Hello World ===
The following is the prototypical [["Hello,_World!"_program|Hello World]] program written in Flix:
<syntaxhighlight lang="Scala">
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Console.printLine("Hello World")
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The type and effect signature of <code>main</code> specifies that it takes no arguments, returns the <code>Unit</code> value, and that the function is impure. The <code>main</code> function must be declared as impure because it invokes <code>printLine</code> which is itself marked as impure.
=== Algebraic Data Types and Pattern Matching ===
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