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feat: port alternating digit sum solution to javascript - #246
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Link to original Codewars problem: Multi-tap Keypad Text Entry on an Old Mobile Phone This helps learners find the original problem statement and understand the T9-style multi-tap keypad input mechanism. Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
Port of python/practice101.py to JavaScript. Solves the problem of calculating alternating digit sums by reading digits left to right, alternating between addition and subtraction. Closes Huerte#219 Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
Aaqibhafeezkhan
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Nov 12, 2026
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- ✅ Selected practice101.py - a simple, well-documented alternating digit sum problem
- ✅ Ported logic to JavaScript with equivalent functionality
- ✅ Added "Ported from: python/practice101.py" header comment per guidelines
- ✅ Maintained the same time complexity O(d)
- ✅ Preserved problem description and source link
This is a straightforward port that helps beginners learn JavaScript by studying a solved algorithm they can already read in Python!
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Summary
Details
This solution reads digits from left to right, adding the first digit, subtracting the next, and continuing to alternate. For example: 521 becomes 5 - 2 + 1 = 4.
Test plan
Closes #219