What Does the '...' (Spread Syntax) Do in React JSX?

Property Spread Notation in React

What's the purpose of the three dots (...) within JSX code in React?

The dots in these instances represent property spread notation. Introduced in ES2018, it's long been supported in React via transpilation.

Property spread notation allows you to "spread out" the enumerable properties of one object into the properties of another. In the case of React, the {...this.props} syntax spreads out the properties of the props object onto the Modal element.

For example, if this.props contains { a: 1, b: 2 }, the following code:

<modal title="Modal heading" animation="{false}"></modal>

is equivalent to:

<modal a="{this.props.a}" b="{this.props.b}" title="Modal heading" animation="{false}"></modal>

Property spread notation is dynamic, meaning it will include whatever properties are present in the props object at runtime. This can be useful for passing multiple properties from parent to child components without explicitly declaring each one.

Since children are also a property of props, property spread notation will include them. Thus, any child elements rendered between the opening and closing tags of the parent component will be passed on to the child component.

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