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JavaScript Quirks Quiz

Fun facts and surprising corners of JavaScript — every developer has encountered these.

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What does typeof null return in JavaScript?

What is the result of 0.1 + 0.2 === 0.3 in JavaScript?

Which of these values are falsy in JavaScript?

What does [] + [] evaluate to?

What is NaN === NaN in JavaScript?

Which Array method returns a new array without modifying the original?

What keyword would you type to access the value of an awaited Promise inside an async function?

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What is the output of typeof undefined?

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