How Does the '...' (Spread Syntax) Work in React Component Properties?

Understanding the Use of Three Dots in React

In React, the three dots (...) are used for property spread notation, a feature introduced in ES2018 that allows developers to spread out the properties of an object as individual properties. This notation is commonly used with the {...this.props} syntax, where this.props represents the properties passed from the parent component to the current component.

By using property spread notation, developers can pass all the properties of the parent component as individual properties to the current component. For example, if the this.props object contains properties a = 1 and b = 2, then the following code would achieve the same result:

<Modal {...this.props} title='Modal heading' animation={false}>

<Modal a={this.props.a} b={this.props.b} title='Modal heading' animation={false}>

Property spread notation also allows developers to pass any child elements present between the opening and closing tags of a component as a children property. This notation provides a convenient and concise way to pass both the component properties and child elements.

For instance, in the following code, even though the child span element is present between the opening and closing tags of the Example component, it is effectively passed as the children property:

<Example className="first">
  <span>Child in first</span>
</Example>

Overall, the use of property spread notation in React simplifies the process of passing component properties and child elements, making code more concise and readable.

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