JavaScript Interview Question-01
When preparing for a JavaScript interview, it’s important to be familiar with common questions that may be asked. One such question is:
What is the difference between null and undefined in JavaScript?
Null and undefined are both used to represent values that do not exist. However, there are some key differences between the two:
- Undefined is a primitive data type in JavaScript, while null is an object. This means that null is actually a reference to a non-existent object.
- When a variable is declared but not initialized, it is automatically assigned the value of undefined by JavaScript.
- Null, on the other hand, is typically assigned to a variable by the developer to explicitly indicate that the variable does not have a value.
It’s important to understand these differences and be able to explain them clearly in an interview setting.
Other Common JavaScript Interview Questions
In addition to the difference between null and undefined, there are many other JavaScript questions that may come up in an interview. Some examples include:
- Explain event delegation in JavaScript and how it can be useful.
- What are closures in JavaScript and how do they work?
- How does hoisting work in JavaScript?
Being prepared to answer these types of questions can help you feel confident and demonstrate your knowledge of JavaScript in an interview.
Conclusion
Preparing for a JavaScript interview can be intimidating, but by familiarizing yourself with common questions and practicing your answers, you can increase your chances of success. Understanding concepts such as the difference between null and undefined can help showcase your knowledge and expertise in JavaScript.
