Frontend Developer interview questions (2086)

200 questions

• What is the difference between var, let and const?

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• How does destructuring work with arrays, objects and defaults?

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• What is the difference between named and default exports?

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• What is the prototype chain?

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• When do you use a Map instead of a plain object?

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• Does const make a value immutable?

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• Write FizzBuzz and explain your choices

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• What is a closure?

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• What do async and await do?

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• What is the difference between setTimeout and setInterval?

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• What is a Promise, and what states can it be in?

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• What are global, function and block scope?

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• Which array methods mutate the array and which return a new one?

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• What are event bubbling and capturing?

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• How is the value of this determined in JavaScript?

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• What is the DOM, and how do you select and change elements?

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• How do for, for...of, for...in and forEach differ for arrays and objects?

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• What are the primitive types in JavaScript?

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• What is the difference between == and ===?

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• What are the common pitfalls of the Date object?

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