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


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More JavaScript Interview Questions

How will you get the checkbox status whether it is checked or not?

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What is NaN in Javascript?

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How to comment javascript code?

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Consider the following code: 1 2 3 4 5 (function() { var a = b = 5; })(); console.log(b); what will be printed on the console?

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What do “1”+2+4 evaluate to?

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What is a way to append a value to an array?

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Name the two functions that are used to create an HTML element dynamically?

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What is event in javascript?

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How do I unblock javascript in chrome?

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Can you run javascript in notepad?

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What are all the types of Pop up boxes available in JavaScript?

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Which built-in method returns the character at the specified index?

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