Câu hỏi phỏng vấn Reactjs
Câu hỏi

What is the purpose of using super constructor with props argument in React?

Câu trả lời

In React, the purpose of using the super constructor with the props argument in a class component is multifaceted and crucial for proper component functionality and inheritance.

  1. Inheritance of Parent Class Properties: The super(props) call in a React component's constructor is necessary to invoke the constructor of its parent class, which is typically React.Component. This invocation is crucial because it ensures that the component inherits all the properties and methods from the parent class, allowing the child component to access React's component lifecycle methods and other features[1][3].

  2. Initialization of this.props: By passing props to super, the properties are bound to this.props in the constructor. This allows the properties passed to the component to be immediately available in the constructor, enabling operations that depend on these properties to be performed right from the start. For example, you might want to initialize the component's state based on the props[1][2][3][4].

  3. Ensuring Functional Integrity: JavaScript's class constructor rules require that if a class extends another class, the child class must call super() before it can use this. In the context of React, this means you must call super(props) before you can use this.props in the constructor. If super(props) is not called, this.props will be undefined in the construc...

junior

junior

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Explain why and when would you use useMemo() ?

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Why do class methods need to be bound to a class instance?

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