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undefined

JavaScript 1.3+, ECMAScript 1.0+, JScript 5.0+ Nav4.06+, IE5+ Syntax

undefined

Description

The undefined property is a primitive value of the global object. It is returned by variables that have not had values assigned to them. It is also returned by methods if the variable being evaluated is not assigned a value. Browsers not supporting this property return null on the undefined variables.


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