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Advanced Frontend with React.js [Eng+Ukr]

Advanced Frontend with React.js [Eng+Ukr]

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When should you avoid using refs in React?

When you need to directly modify the DOM.

❌

When handling animations and transitions.

❌

When you can use state and props to achieve the same result.

✅

When accessing third-party libraries.

❌

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How does useRef differ from useState in terms of updating and re-rendering?

useState updates cause re-renders, while useRef updates do not

useRef updates cause re-renders, whereas useState does not

useState holds primitive values only, while useRef holds complex objects

useRef only works with DOM elements, while useState does not

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How to create ref?

refCreate()

useRef()

React.ref()

React.current(ref)

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Good cases for using refs:

Reading from input elements

❌

Managing media playback

✅

Triggering imperative animations

✅

Handling modal window closing

❌

Managing focus

✅

Writing into input elements

❌

Integrating with third-party DOM libraries

✅

Using with forms

Managing text selection

✅

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Which of the following is a reason for using HOCs?

Fetching data from an API

❌

Styling components

❌

Reusing component logic

✅

Managing component state

❌

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How to create a HOC that passes additional ref to a component?

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What problem does React.forwardRef solve in React applications?

It helps manage component state.

It simplifies the use of context in functional components.

It allows passing a ref through a component to one of its children.

100%

It provides a way to share state between components.

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What the HOK describes

HOC doesn’t use inheritance to copy input component behavior

✅

HOC is a callback function

❌

HOC composes the original component by wrapping it in a container component

✅

HOC doesn’t modify the input component

✅

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How would you define a HOC named withExtraProps that adds extra props to a component?

100%

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Will the next code compile with TypeScript?

  let s = "hello"
  s = 1;

Yes, we can reassign value of another type to a variable, because we didn't specify the type in declaration

❌

No, we will get an error that type 'number' is not assignable to type 'string'

✅

No, we will get an error that variable has not specified type at declaration

❌

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