The original title is: "How the Brazilian CPF Validation Algorithm Works in JavaScript (Step-by-Step)"

Short summary

A beginner-friendly walkthrough of the Brazilian CPF (individual taxpayer ID) validation algorithm with a JavaScript implementation. Explains the two check-digit calculation steps using weighted sums and modulus 11, and links to an open-source GitHub repository. Code snippets are incomplete and the explanation is shallow.

• •CPF uses 11 digits with two mathematically derived check digits
• •Validation uses weighted sums mod 11 for each check digit
• •Author provides an open-source JS validator on GitHub

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