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


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More JavaScript Interview Questions

What is dhtml in javascript?

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What does dynamic component in javascript contain?

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Write a program that inputs a 5-digit integer from the keyboard and prints if the input number is a palindrome or not. A palindrome is a number which has the same digit from either end.

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How to read elements of an array in JavaScript?

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what is the source code for sendRedirect method()java Servlet program?

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What Is The Disadvantages Using InnerHTML In JavaScript?

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a code in vb script, which creates a table of 5*2 in html this is a static table, one more same dynamic table, as we give input the table should get created.

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What is the best site to learn javascript?

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What is the scope variable in javascript?

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What is the difference between innerhtml and append() in javascript?

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What are the types of data types?

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How do you extend classes Code snippet: const circle = { radius: 20, diameter() { return this.radius * 2; }, perimeter: () => 2 * Math.PI * this.radius };

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