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Design Pattern

Visitor

Add operations to object structures without changing those objects.

behavioral

Visual Diagram

Visitor
-> visitUser()
-> visitOrder()
-> visitInvoice()

When To Use

  • ->AST transforms
  • ->Linting rules
  • ->Tree traversal with many operations
  • ->Exporting different object types
Used in: AST transforms, Babel plugins, tree walkers
visitor.js

Live Editor

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Output

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