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mediumTechnical2024

Custom getElementsByClassName traverse

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01

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Implement the scenario utility: Custom getElementsByClassName traverse. Discuss edge cases, runtime performance, and alternative paradigms.

js-codingutilityalgorithm
02

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03

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💡 How to Think About This Problem

When implementing Custom getElementsByClassName traverse in a frontend interview, candidate developers should focus on structural correctness, managing execution bindings, and minimizing performance overhead.

1. Deconstructing the Requirements

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04

Read the code

Example usage
function customGetElementsByClassName(node, className, results = []) {
  if (node.classList && node.classList.contains(className)) {
    results.push(node);
  }
  for (const child of node.children || []) {
    customGetElementsByClassName(child, className, results);
  }
  return results;
}

// Example placeholder
// console.log(customGetElementsByClassName(document.body, 'button'));
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