Design Patterns · Middle · Question 15 of 75

Which pattern does a Babel or ESLint plugin use when it walks the AST with `Identifier()` and `CallExpression()` methods?

✓Correct answer: Visitor: operations on tree nodes are moved into a separate object
2Builder: the plugin creates a new tree from the source one step by step
3Adapter: the plugin converts the AST to another compiler's format

Explanation

Visitor lets you add new operations over a structure (checks, transformations) without changing the node classes. The traverser calls the visitor's method for each node type.

Which pattern does a Babel or ESLint plugin use when it walks the AST with `Identifier()` and `CallExpression()` methods?

Explanation

Further reading

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Test yourself

Which pattern does a Babel or ESLint plugin use when it walks the AST with Identifier() and CallExpression() methods?

Explanation

Further reading

Test yourself

Which pattern does a Babel or ESLint plugin use when it walks the AST with `Identifier()` and `CallExpression()` methods?