Full Stack Developer Interview Questions And Answers

Question 1: What is an Event Loop in Node.js?

Answer: Event Loop is the control flow constructs in Node.js. In short, Event Loop is a mechanism that delegates the responsibility of handling events and requests in Node, making it faster and more efficient than other technologies.

Question 2: What will the output of the following code?
var x = {foo:1};
var output = (function () {
delete x.foo;
return x.foo;
}
) ();
console.log(output);

Answer: The output for the above code will be UNDEFINED since the DELETE operator is used for deleting properties from objects. In this code, we are trying to reference a deleted property, therefore, the result will be UNDEFINED.
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