Web Reference: Jul 10, 2025 · The TypeError object represents an error when an operation could not be performed, typically (but not exclusively) when a value is not of the expected type. As that is usually by mistake, the solution is to check your code and fix the null/undefined condition so that the function either gets a proper Object, or does not get called at all. In this article, you’ll learn some of the reasons a TypeError occurs, techniques to prevent them, and how to handle a TypeError when it does occur. A TypeError occurs when an operation cannot be performed because the value is not of the expected type. Here are a few examples:
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