Web Reference: If it is undefined, it will not be equal to a string that contains the characters "undefined", as the string is not undefined. You can check the type of the variable: Jul 8, 2025 · The JavaScript exception "x is (not) y" occurs when there was an unexpected type. Oftentimes, unexpected undefined or null values. Apr 17, 2023 · You can use different variable names, constants, or deep copies to avoid overwriting the object. If none of these solutions work for you, you can use a debugger tool like Firebug or Chrome DevTools to inspect the value of the object and find out where and why it becomes undefined or null.
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