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. A TypeError may be thrown when: an operand or argument passed to a function is incompatible with the type expected by that operator or function; or Jul 11, 2025 · In this handbook, you’ll learn everything you need to know about error handling in JavaScript. We will start with an understanding of errors, their types, and occurrences. Then you’ll learn how to deal with these errors so that they don’t cause a bad user experience. 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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