Looking to prepare for your upcoming JavaScript Developer Interview?

You’ve come to the right place.

We’ve searched high and low, and spoken to industry professionals to hear what questions could come up in your next interview.

Below are 5 commonly asked JavaScript Developer interview questions along with our suggestion on how to best answer.

Can you describe how event bubbling and capturing works in JavaScript?

The interviewer will want to assess your understanding of the event propagation process, event handling and your ability to manipulate event flow.

What is hoisting in JavaScript?

Hoisting is a mechanism in JavaScript where variable and function declarations are moved to the top of their containing scope during the compilation phase. The interviewer wants to access whether you understand how code is processed during compilation and execution.  Mention how hoisting can impact code readability and potential bugs.

What are closures in JavaScript and how/why would you use them?

Asking about closures helps the interviewer understand your knowledge of advanced JavaScript concepts like lexical scoping, variable scope, and function execution context.

What is the difference between == and === in JavaScript?

Both ‘==’ and ‘===’ are comparison operators in JavaScript. The ‘==’ operator compares values for equality, performing type coercion if necessary. On the other hand, the ‘===’ operator checks for both value and type equality, ensuring that no type conversion takes place during the comparison.

How do you manage conflicting priorities with tight deadlines?

The interviewer wants to understand how you plan and time manage your commitments to ensure all project deadlines are met.

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