Web Reference: If you're changing the prototype of the built-in 'function' object it's possible you're running into a browser bug or race condition by modifying a fundamental built-in object. Jul 9, 2025 · If your code doesn't work and/or the browser complains that something is undefined, check that you've spelt all your variable names, function names, etc. correctly. Oct 31, 2023 · JavaScript‘s "function is not defined" error happens when a function is called from an unaware scope or by a mismatched name. Use precise, consistent naming and spelling for functions.
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