type Foo = { a: string; b: number; c: null; d: boolean; } // FooKeys type FooKeys = keyof Foo // How to declare a new type based on FooKeys, but without the values b and d? type FooKeysWithoutBD
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Frontend
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What does a component re-render in React depend on?
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How to declare a new type based on Foo, but without fields a and c, without using Omit?
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How to make try/catch construct work with Promise? How to make Promise synchronous using async/await?
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In what order will console.log be output and why? Explain the order of execution of synchronous and asynchronous code (Event Loop, macro- and microtasks).
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How to make a function with a Generic accept only a string or an instance of class Bar, and throw a TypeScript error in other cases?
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What was your approach to writing CSS? Are you familiar with the CSS-in-JS approach?
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function delayFunc(fn, delay) { return function c(...args) { return new Promise((resolve) => { setTimeout(() => { fn(...args) }, delay * 1000) }) } } function sum(a, b) { console.log(a + b) } const delayedSum = delayFunc(sum, 5); await delayedSum(3, 2); // after 5 seconds, outputs 5 await delayedSum(5, 3); // after 5 seconds from the previous, outputs 8
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Why pass a function (c => c + 1) to setCount instead of just setCount(tick + 1)?
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<div class="list"> <div class="item">1</div> <div class="item">2</div> ... <div class="item">N-1</div> <div class="item">N</div> </div>
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Can the same be implemented through setTimeout instead of setInterval?
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What is a dependencies array in useEffect? What happens if you pass an empty array or do not pass it at all?
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Tell about the most complex task in your entire experience.
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How to make the result type not 'any', but match the argument type using Generics?
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There is an App component and a Rand component from a third-party library that outputs a random number. How to make the random number change every 3 seconds and display a counter of the number of changes? All in the App component.
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// It is necessary to move the re-render logic to a separate external hook, // which allows working with the timer from outside (for example, stopping it after 10 seconds). // Create a new RandOnce component based on the Rand component, // which when used in App // will not update the random number every 3 seconds, but will output a random number only once.
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How does the keyword 'type' differ from 'interface' in TypeScript? Explain inheritance in types and interfaces.
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You have assessed the task, taken it on, and realize that you have estimated it incorrectly and cannot complete it on time. What do you do at this moment?
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What ways are there to handle errors in Promise? Can try/catch be used?
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Tell us about your work experience. How was the task planning process organized?
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