What is a callback url?
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What are arrays in javascript?
What is stack in javascript?
What is console.time() and console.timeend()? What is its syntax, and why is it used?
What is a null variable in javascript?
How to delete an array entry using javascript?
What is the use of isNaN function?
Is javascript used for backend?
What is difference between local and global scope in javascript ?
What is a named function in JavaScript? How to define a named function?
What is closure? Give an example.
What is singleton class in javascript? Explain
What are the ways of making comments in javascript?