1. Automate Caching

• Repeated request and responding to those request consumes resources and this becomes a sign of flawed design. To solve this problem you must store data fetched from the API on the server and serve later from there.
• However, there are times when the data becomes outdated and needs to be updated, in this case, we have some industry caching solutions (Redis and Amazon ElasticCache) that can cache data even after making changes.

2. API Documentation

Always provide clear and concise documentation is necessary for any API, it becomes harder to use that API later without good documentation. …

Build your JavaScript projects in less time.

1. cypress

Fast and reliable testing for anything that runs in a browser.

1. Use RegExp literal notation when the RegExp will be changing & use the RegExp constructor function when the RegExp will remain constant. Is that true?

• No, this is the opposite.
• Use RegExp constructor notation when the RegExp will be changing.
• And use the RegExp literal notation when the RegExp will remain constant.

2. Promises are asynchronous in JavaScript. Is that true?

• No, they are synchronous, still, they can perform async actions such as making calls to an API.

3. What’s the purpose of web workers?

• To execute expensive tasks on a separate thread than the main thread.

4. What type of object will Promise.resolve return?

• A promise in a resolved state with a given resolved value.

5. What’s the difference between setTimeout() and setInterval()?

• setTimeout executes once after a specified time has elapsed.
• setInterval executes repeatedly with a given delay between executions.

6. What’s the difference between importing a default export, named, and a non-deafult export?

• Curly braces.

7. Function declarations are hoisted, function expressions are not hoisted. Is that true?

• Yes

8. What statement shows the url from which a module was imported?

• import.meta, this will work if experimental support for import.meta is on.

9. What is the difference between console.log, console.error, and console.warn?

• All…

1. Which properties give access to the global object regardless of the environment?

• globalThis

2. What will be the console output and why?

1. What is a wrapper object when considering coercion?

• It can be a wrapper around a primitive to give the primitive properties.
• For example, when attr is wrapped in a String object when we try to access the String object properties.

1. What is a Generator Function in JavaScript?

• According to MDN Docs: Generators are functions that can be exited and re-entered later. For example, a while-loop in a generator function can be paused.

2. What’s the difference between RegExp literal notation and constructor?

• The literal notation’s parameters are enclosed between slashes and have no quotation marks.
• The constructor function does not use slashes but has quotes.
• The literal notation is evaluated at compile time.
• The constructor is evaluated at runtime.

3. A do-while loop always executes at least once. Is that true?

• Yes, the ‘do’ part of the do-while loop is entered into before any truthy evaluation is processed.

4. What data types does JSON support?

• string
• number
• object
• null
• array
• boolean

5. What will be the console output?

55 JavaScript Coding Interview Questions.

1. What Makes the Two Given Functions Different?

1. Which of the following prints first?