Lea Verou 12/14/2018

ReferenceError: x is not defined?

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This article details a JavaScript developer's experiment to reliably identify 'variable not defined' ReferenceErrors within a try-catch block. It presents findings from testing error messages across numerous browsers (Chrome, Firefox, Safari, Edge, IE) and provides a code snippet using a regex pattern to detect these specific errors, while acknowledging the inherent risks of this approach.

ReferenceError: x is not defined?

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