- Why do you want to work someplace else?
- Where can you find out about the latest news and trends in JS and coding in general?
- What was the best thing about your last job?
- What did you not like about it?
- How do you know you can write good code?
- What are your worst skills at programming?
- Where do you see yourself in five years?
- Why should we hire you as our next JS developer?
- What is the most important thing you’ve done at work?
Questions about work and history from the past
But your interviewer will also want to know how you got to where you are now and if your skills and experience make you a good fit. In the next section, we answer some of the most common questions about background and experience:
- What other programming languages do you know?
- What made you want to learn how to code?
- Are there any languages or ways of coding for which you have a certificate?
- Since when have you been a programmer?
- What’s the most recent programming language you learned?
- What’s different about a scripting language from other languages?
- In JS, what is a “spread operator?”
- How do I remove duplicates from JS?
- What is a Promise in JS?
- What’s the difference between Array.splice() and Array.slice()?
- How do you do 301 redirects with JS?
- How do you use the setTimeout function?
Explain the difference between global scope and local scope.
- Write down the different kinds of JS errors that can happen.
- What does it mean in JS for a function to be “anonymous”?
- What are equality operators?
- What is the purpose of a scope chain?
- What do console.time() and console.timeEnd() do?
- How do you call a function after a certain amount of time has gone by?
- How do accessors in JS work?
- What are some popular frameworks for unit testing in JS?
- Shallow copy is not the same as deep copy.
- Why is using JS a good idea?
- Why does a JS source file need a function block around the code?
- What is NaN and what does it do?
- Describe variables that haven’t been set or haven’t been declared.
Why is using JS a good idea?
- It is a language that runs on the client, not on the server.
- JS is quick.
- It doesn’t require a compiler.
- It is pretty easy to test and fix bugs.
- It is an event-driven language, which makes it easy for many developers to use.
When answering, think about what role you’ve played in development and which of these benefits is most important to you.
Java is a server-based programming language. At the time of compilation, variables must be set up and checked. Java program files are.
java, Java is standalone.
Why does a JS source file need a function block around the code?
This method is being used more and more in JS libraries that developers might use. If you know how to answer this question, it shows that you know about things that may only be done in libraries.
What is NaN and what does it do?
If someone asks you to explain a word, it’s probably something you use every day. In this case, the term is “not a number,” which is written as “NaN.” This is something about values that JS developers need to know.
“If the value is not a number, the result of an operation is NaN.” This can happen in several different ways. For example, when an operation cannot be returned because part of a function was not a number or the value of the operation was not a number.
- Boolean information can either be true or false.
- Number: A numeric value.
- These are groups of related information that show what’s going on.
- String: Values are stored in a string between the quotation marks.
- These objects have been named, but they haven’t been set up yet.
Describe variables that haven’t been set or variables that haven’t been declared.
“Variables that haven’t been set up yet because they aren’t part of a program are called “undeclared.” If a program tries to run the variables before they are declared, it will log a runtime error. Undefined variables are ones that are declared but don’t have a value.