We can pass spread props along with regular props in React:
We can even spread multiple objects while passing props to a component:
However, it is necessary to understand that if multiple values are provided for the same prop, the component will get the value specified last.
To illustrate this concept, let's consider an example with a Settings component that accepts the following props:
theme (either "dark" or "light")languageisNotificationEnabled
We have two objects: defaultSettings and userSettings.
We can use these objects to pass props to the Settings component. Now, let's examine different scenarios to understand how the ordering of props affects the values:
-
When we pass only defaultSettings using spread syntax:
<Settings {...defaultSettings} />
/*
Received props in Settings component:
theme: "light"
language: "English"
isNotificationEnabled: undefined
*/
-
When we pass defaultSettings using spread syntax, but also explicitly set theme to "dark":
<Settings {...defaultSettings} theme="dark" />
/*
Received props in Settings component:
theme: "dark"
language: "English"
isNotificationEnabled: undefined
*/
-
When we pass defaultSettings using spread syntax, and then pass userSettings using spread syntax:
<Settings {...defaultSettings} {...userSettings} />
/*
Received props in Settings component:
theme: "dark"
language: "English"
isNotificationEnabled: true
*/
-
When we explicitly set theme to "light", language to "spanish", and then pass userSettings using spread syntax:
<Settings theme="light" language="Spanish" {...userSettings} />
/*
Received props in Settings component:
theme: "dark"
language: "Spanish"
isNotificationEnabled: true
*/
By changing the ordering of props, we can control the values of props received by the component and ensure the desired behavior.