Variable shadowing in JavaScript occurs when an inner variable hides an outer one with the same name, leading to unexpected behavior and making code harder to debug. Understanding scoping rules can help avoid it. Best practices include using unique names, avoiding global variables, and being mindful of scope.
Variable shadowing in JavaScript occurs when an inner variable has the same name as an outer variable, causing the inner one to "hide" the outer one and leading to unexpected behavior and debugging issues. This can happen due to scoping rules and closures, making it essential to use unique names, be mindful of scope, and code wisely.
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