What does a 'Function is not defined' error in JavaScript typically mean?

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Grade: Education Subject: Support
What does a 'Function is not defined' error in JavaScript typically mean?
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A 'Function is not defined' error in JavaScript occurs when you attempt to call a function that hasn't been declared or defined in the current scope. This can happen if you've misspelled the function name, forgot to define it, or are trying to use it before it's been declared.