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JavaScript Plot Twists

Real bugs caused by JavaScript doing exactly what the spec says — and nothing you expected.

Your guide: Twisty. Has read the spec. Is still surprised every time.

1 of 5 parts published · 5 min total

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  1. 1The Leaderboard That Ranked 9 Points Above 100Why JavaScript's sort() compares numbers as strings, why a 'lazy' comparator works in Safari but breaks in Chrome, and the one-line fix.
    5 min read3
  2. 2Why ['1', '7', '11'].map(parseInt) returns [1, NaN, 3]Coming soon
  3. 3The return statement that returned undefinedComing soon
  4. 40.1 + 0.2 and the invoice that was off by one centComing soon
  5. 5The object key that reordered itselfComing soon

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