Trivia questions and answers, drawn fresh from the well

• Easy Easy difficulty.
• Javascript

Which method is used to remove the first element from an array?

Answer

shift()

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• Easy Easy difficulty.
• Javascript

What does the typeof operator return for a function?

Answer

"function"

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• Hard Hard difficulty.
• Javascript

In which year was the first ECMAScript standard (ES1) published?

Answer

1997

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• Hard Hard difficulty.
• Javascript

Which Node.js EventEmitter method registers a listener that fires only once?

Answer

once()

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• Intermediate Intermediate difficulty.
• Javascript

Which method converts a JavaScript value to a JSON string?

Answer

JSON.stringify

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• Intermediate Intermediate difficulty.
• Javascript

Which built-in object requires keys to be strings or symbols?

Answer

Object

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• Intermediate Intermediate difficulty.
• Javascript

What is the purpose of 'use strict' directive?

Answer

Enables strict mode

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• Intermediate Intermediate difficulty.
• Javascript

What does the 'arguments' object contain in a non-arrow function?

Answer

All passed arguments

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• Intermediate Intermediate difficulty.
• Javascript

Which operator checks if an object has a property?

Answer

in

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• Intermediate Intermediate difficulty.
• Javascript

What does the spread operator (...) do when used in function calls?

Answer

Expands an array into individual arguments

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• Intermediate Intermediate difficulty.
• Javascript

Which array method creates a new array with elements that pass a test?

Answer

filter

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• Easy Easy difficulty.
• Javascript

What keyword is used to create a class in JavaScript?

Answer

class

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