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This function undefines a variable, Object property, or value.
The variable or object property to be undefined
If a value was previously defined so that its use with the defined() method returns true, then after using undefine() with the value, defined() returns false. Undefining a value is not the same as setting a value to null. In the following fragment, the variable n is defined with the number value of 2, and then undefined.
var n = 2;
In the following fragment an object o is created, and a property o.one is defined. The property is then undefined, but the object o remains defined.
var o = new Object;
o.one = 1;