How would you check if a variable is null/undefined?


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More JavaScript Interview Questions

What is the best site to learn javascript?

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What is the difference between script type and the script language attributes?

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What is the reason for wrapping the entire content of a javascript source file in a function book?

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How do I turn off javascript in chrome?

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What are self invoking functions?

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What is lazy instantiation in java?

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what will happen and why if i will acess the methods of superclass which is declared as private by a object of same subclass.

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Explain equality operators in javascript?

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What happens when the recursion calling is applied on two functions?

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Which built-in method returns the calling string value converted to lower case?

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Explain the role of deferred scripts in javascript?

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How do I run code in browser console?

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