Description of Shedding Light on the JavaScript Special Values null and undefined :
This is a quick reference article that discusses about defining and using null and undefined (special values) and testing for null in javascript. This reference explains that null is a value which is used for the indication of the absence of the valid data in a variable and undefined is the value that has to be provided to the variables after confirming that there is no value assigned to them. This reference will be useful for the programmers to gather more information about javascript special values.
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