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Evolving JavaScript with Douglas Crockford
Software Engineering Daily
Embrace the Complexity: Understanding Null and Undefined
Null and undefined serve distinct purposes in JavaScript, with undefined representing missing values and functioning as a sentinel for absent elements in arrays. While undefined is considered a useful feature, null is seen as unnecessary, resulting from historical choices made by early developers. The desire to rectify the confusion between these two concepts is hindered by JavaScript's commitment to maintaining backward compatibility, especially given its integral role on the web. This reliance on existing programs prevents any definitive changes to the language, despite a strong inclination from some developers to address these inconsistencies and improve clarity.
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