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@misrasaurabh1 misrasaurabh1 commented Sep 23, 2025

PR Type

Enhancement, Tests


Description

  • Add common tag extraction utility

  • Introduce tests for common tags


Diagram Walkthrough

flowchart LR
  A["Articles list"] -- "compute intersection" --> B["find_common_tags()"]
  B["find_common_tags()"] -- "returns" --> C["Set of common tags"]
  D["tests/test_common_tags.py"] -- "validates" --> B["find_common_tags()"]
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File Walkthrough

Relevant files
Enhancement
common_tags.py
Add utility to compute common tags                                             

codeflash/result/common_tags.py

  • Implement find_common_tags function.
  • Handles empty input by returning empty set.
  • Computes intersection across article tags.
+11/-0   
Tests
test_common_tags.py
Add tests for common tags utility                                               

tests/test_common_tags.py

  • Add tests for find_common_tags.
  • Validate common tags across 3 and 4 articles.
+22/-0   

Signed-off-by: Saurabh Misra <[email protected]>
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PR Reviewer Guide 🔍

Here are some key observations to aid the review process:

⏱️ Estimated effort to review: 2 🔵🔵⚪⚪⚪
🧪 PR contains tests
🔒 No security concerns identified
⚡ Recommended focus areas for review

Performance

Intersection is computed by repeated list filtering (O(nmk)). Converting to sets and using set intersection would be clearer and more efficient for larger inputs.

common_tags = articles[0].get("tags", [])
for article in articles[1:]:
    common_tags = [tag for tag in common_tags if tag in article.get("tags", [])]
Type Robustness

Function assumes every article has 'tags' as a list of strings; consider validating or coercing to a set to avoid duplicates and type issues, and document behavior when 'tags' missing or not a list.

def find_common_tags(articles: list[dict[str, list[str]]]) -> set[str]:
    if not articles:
        return set()

    common_tags = articles[0].get("tags", [])
    for article in articles[1:]:
        common_tags = [tag for tag in common_tags if tag in article.get("tags", [])]
    return set(common_tags)

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PR Code Suggestions ✨

Explore these optional code suggestions:

CategorySuggestion                                                                                                                                    Impact
General
Use set intersections for tags

Convert tags to sets and use set intersection for correctness and performance. This
avoids O(n^2) list membership checks and preserves behavior even with duplicate
tags.

codeflash/result/common_tags.py [8-11]

-common_tags = articles[0].get("tags", [])
+common_tags = set(articles[0].get("tags", []))
 for article in articles[1:]:
-    common_tags = [tag for tag in common_tags if tag in article.get("tags", [])]
-return set(common_tags)
+    common_tags &= set(article.get("tags", []))
+return common_tags
Suggestion importance[1-10]: 8

__

Why: Replacing list filtering with set intersections is correct here, improves time complexity, and simplifies the code; the improved_code accurately reflects the intended change and matches the provided existing lines.

Medium

Co-authored-by: codeflash-ai[bot] <148906541+codeflash-ai[bot]@users.noreply.github.com>
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codeflash-ai bot commented Sep 23, 2025

This PR is now faster! 🚀 Saurabh Misra accepted my code suggestion above.

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