Question Archive

Which method is used to merge two or more objects into a target object?

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What does the Object.freeze() method do?

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What is the output of: [1, 2, 3].indexOf(4)?

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What does the rest parameter (…args) do in a function definition?

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Which loop guarantees that its body executes at least once?

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What is the output of: Boolean([]) in JavaScript?

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What does the String.prototype.trim() method do?

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What is event bubbling in JavaScript?

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What does event.preventDefault() do?

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Which method is used to attach an event listener to a DOM element?

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What does the await keyword do inside an async function?

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What does the async keyword do when placed before a function declaration?

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What is the purpose of the Promise.all() method?

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What does Object.keys() return?

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Which string method returns the index of the first occurrence of a substring, or -1 if not found?

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What is the output of: console.log(typeof function(){})?

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What does the logical nullish assignment operator (??=) do?

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What is the purpose of the Array.isArray() method?

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