JavaScript and React Quiz

What is the purpose of axios.get() in JavaScript?

• To send data to a server

• To fetch data from a server

• To update data on a server

• To delete data from a server

Which method is used to test if an array contains a specific element?

• find()

• includes()

• filter()

• some()

In JavaScript, what does Object.freeze() do?

• Prevents new properties from being added but allows existing properties to change

• Prevents adding or removing properties but allows property values to change

• Prevents adding, removing, or changing properties

• Converts an object to a string

Which lifecycle method is used to run code after a React component mounts?

• componentWillMount

• componentDidUpdate

• componentDidMount

• componentWillUnmount

What is the output of this code? const foo = () => ({ bar: 1 }); console.log(foo());

• { bar: 1 }

• bar: 1

• undefined

• SyntaxError

Which function is used to delay execution in JavaScript?

• setDelay()

• setTimeout()

• wait()

• delay()

In React, what is a prop?

• A function that modifies state

• A special variable used to create components

• A way to pass data from parent to child components

• A global variable

What does Promise.race() do?

• Returns the fastest resolved or rejected promise

• Returns the last resolved promise

• Waits for all promises to resolve

• Cancels all promises if one fails

What is unit testing?

• Testing individual units or components in isolation

• Testing multiple components together

• Testing an entire application

• Testing only the UI

How do you make an Axios POST request?

• axios.send()

• axios.post()

• axios.create()

• axios.put()