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Array.prototype.diff(meaCulpa)
When extending JavaScript's core functionality goes wrong—learn from the Array.prototype.diff() mea culpa. A follow-up to the original diff method that adds proper type checking with instanceof, because sometimes you need to watch your data types more carefully.
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Array.prototype.diff()
When you need to highlight new feed items but don't want to Google the solution—build your own Array.prototype.diff() method. A fun problem-solving approach to comparing arrays, complete with real-world examples of long-polling feeds and the satisfaction of solving it yourself.