This article explains the Visitor design pattern, illustrates its structure, and provides a complete Java implementation that lets HR and finance departments process full‑time and part‑time employee data in an OA system without modifying existing classes.
This article walks through the core concepts and implementation steps of a minimal JavaScript compiler, covering tokenization, parsing into an AST, traversing with a visitor, transforming the tree, and generating target code, while also explaining the visitor pattern and polyfills.
This article explains how to use the TiDB SQL parser to create custom SQL fingerprints by traversing the abstract syntax tree, replacing literal values with placeholders, and restoring the modified tree back to SQL, offering a more maintainable alternative to string‑based approaches.
This article explains what an Abstract Syntax Tree (AST) is, its role in JavaScript tooling such as Babel, UglifyJS, and type checking, details the lexical and syntactic analysis stages of AST generation, and demonstrates a practical Babel plugin example that modifies console output using visitors.
