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Declaring a variable before using it is required.
Declaring an object before using it is required.
The function cannot be deleted.
Duplicating a parameter name is not allowed.
Octal numeric literals are not allowed.
Octal escape characters are not allowed.
Modifying a read-only property is not permitted.
Modifying a get-only property is not permitted.
Deleting an undeletable property is not allowed.
The use of the reserved word "eval" as a variable is not permitted.
The use of the reserved word "arguments" as a variable is not permitted.
withstatement is not allowed.
For security reasons, using eval() to create variables in the scope from which it was called is not permitted.
In strict mode, eval() can not declare a variable using the var or let keyword.
It is a good practice to use strict mode because it can help you avoid mistakes and make your code more robust and maintainable.