Dan Abramov • 9/2/2025

A Lean Syntax Primer

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This article is a beginner-friendly guide to the Lean programming language's syntax. It explains how to declare definitions, specify and infer types (like String, Nat, and Int), and run code, using examples such as calculating a birth year. It also introduces the concept of proving facts about code.

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#lean #programming language #syntax
A Lean Syntax Primer

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