Some of the most common complaints about JavaScript come from its dynamic, mutable nature. You can modify nearly any member of any object and even delete some built-in ones! This enables web developers to improve cross-browser compatibility of their sites while maintaining code readability with a technique called poly-filling. On the other hand, it also allows developers to modify built-in behavior (called “monkey-patching”), sometimes causing side-effects or bugs that are difficult to troubleshoot.
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