The JavaScript exception "Permission denied to access property" occurs when there was an attempt to access an object for which you have no permission.

The JavaScript exception "Initializing an object twice is an error with private fields/methods" occurs when an object that was created via a class constructor goes through the class construction again, and the class contains a private element. This is usually caused by the return override trick.

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The JavaScript exception "label not found" occurs when a break or continue statement references a label that does not exist on any statement that contains the break or continue statement.

The JavaScript exceptions "unexpected token" occur when the parser does not see a token it recognizes at the given position, so it cannot make sense of the structure of the program. This might be a simple typo.

Iteration protocols aren't new built-ins or syntax, but protocols. These protocols can be implemented by any object by following some conventions.

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The JavaScript exception "precision is out of range" occurs when a number that's outside of the allowed range was passed into toExponential, toFixed, or toPrecision.