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Questions and Answers

What is the main purpose of using a 'closure' in programming?

To encapsulate data within a function
To pass arguments to a function by reference
To create parallel execution of code blocks (correct)
To prevent code from executing until a condition is met

Which JavaScript data type is not classified as a primitive type?

Array (correct)
String
Boolean
Number

What distinguishes 'null' from 'undefined' in JavaScript?

"Undefined" is a keyword used for function parameters, while "null" is used for variable declarations
"Null" indicates the absence of a value, while "undefined" means a variable has been declared but not assigned a value (correct)
"Null" is a primitive data type, while "undefined" is an object
They are essentially the same and can be used interchangeably

What does the 'z-index' property in CSS primarily control?

To control the vertical stacking order of elements that overlap (D) Signup and view all the answers

Why do programming languages utilize 'closures'?

To establish private variables and functions within functions (A) Signup and view all the answers

When styling web elements, what does the 'display' property in CSS help control?

The layout and rendering behavior of elements (D) Signup and view all the answers

What is the purpose of the 'JOIN' clause in SQL?

Combines rows from two or more tables based on a related column between them (B) Signup and view all the answers

What does the 'cluster' module in Node.js primarily do?

To manage and distribute tasks across multiple CPU cores for improved performance (B) Signup and view all the answers

In JavaScript, what does the 'this' keyword primarily refer to?

To refer to the current object context within a function or method (D) Signup and view all the answers

What is the main function of the 'GROUP BY' clause in SQL?

Groups rows with the same values into summary rows (B) Signup and view all the answers

In React, what does 'props drilling' refer to and how can it be addressed?

Props drilling refers to passing data through multiple layers of components, and it can be mitigated using context or Redux for state management (D) Signup and view all the answers