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Undefined identifier

  • Article

You attempted to use an identifier that the JavaScript compiler does not recognize. The undefined value is returned whenever you use:

  • a variable that does not exist,

  • a variable that has been declared, but never had a value assigned to it,

  • an object property that does not exist.

To correct this error

  • Declare the variable with a var statement (as in var x;).

See also

Variables
Variable Scope