| 5. 1. 9. The Null Type |
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The Null type, has only the special value null. |
NUll is also its literal. |
The value undefined is actually a derivative of the value null, so JavaScript defines them as equal to each other. |
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alert(null == undefined); //outputs "true"
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Undefined is the value assigned when a variable is declared and not initialized. |
Null is the value used to represent an object that doesn't exist. |