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What is the difference between "var" and "let" in JavaScript?

• "var" is block-scoped, while "let" is function-scoped

• "var" is function-scoped, while "let" is block-scoped

• "var" is a constant, while "let" is a variable

• There is no difference

What is the purpose of the "useState" hook in React?

• To declare a state variable

• To declare a function component

• To create a class component

• To declare a context object

Which of the following is NOT a valid way to declare a JavaScript function?

• function myFunction() {}

• const myFunction = function() {}

• () => {}

• var myFunction = () => {}

What is the purpose of the JavaScript "spread" operator?

• To combine two arrays

• To split a string into an array

• To clone an object or array

• To delete a property from an object

Which of the following is NOT a valid CSS position value?

• relative

• static

• absolute

• fixed

What is the purpose of the "className" attribute in HTML and React?

• To specify a unique identifier for an element

• To assign a CSS class to an element

• To specify the type of an input element

• To specify the value of an input element

Which of the following is NOT a valid React prop?

• onClick

• className

• href

• style

What is the purpose of the JavaScript "slice" method?

• To add an element to the beginning of an array

• To remove an element from an array

• To return a copy of a portion of an array

• To sort the elements of an array

Which of the following is NOT a valid Bootstrap component?

• Navbar

• Carousel

• Accordion

• Counter

Which of the following is NOT a valid way to define a CSS color?

• #000000

• rgb(0, 0, 0)

• rgba(0, 0, 0, 1)

• hsl(0, 0%, 0%)