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- ReferenceError: "x" is not defined
- Wrong scope
- Valid cases
- Update older browsers
- SyntaxError: a declaration in the head of a for-of loop can't have an initializer
- Valid for-of loop
- SyntaxError: arguments is not valid in fields
- TypeError: 'x' is not iterable
- Iterating over Object properties
- Iterating over a generator
- Iterating over a custom iterable
- TypeError: can't assign to property "x" on "y": not an object
- Common JavaScript Errors: ReferenceError, SyntaxError, and TypeError Quiz 5 questions
Well done!
You have completed (UPI) Chapter 11: Managing Errors, Debugging, and Handling Events in JavaScript!
Instruction
ReferenceError: "x" is not defined
The JavaScript exception "variable is not defined" occurs when there is a non-existent variable referenced somewhere.
Message:
- ReferenceError: "x" is not defined (V8-based & Firefox)
- ReferenceError: Can't find variable: x (Safari)
Error type:
ReferenceError
What went wrong?
There is a non-existent variable referenced somewhere. This variable needs to be decla...