props vue 3

In Vue 3, props are used to pass data from a parent component to a child component. Here are the steps involved in using props in Vue 3:

1. Define Props: In the child component, define the props that you want to receive from the parent component. This is done using the props option. For example, if you want to receive a prop named message, you would define it like this:

props: {
  message: String
}

1. Pass Props: In the parent component, pass the data to the child component using the attribute syntax. For example, if you want to pass a message to the child component, you would do it like this:

<ChildComponent message="Hello, World!" />

1. Use Props: In the child component, you can access the props using the this keyword. For example, if you want to display the message prop, you would do it like this:

<p>{{ message }}</p>

1. Type Validation: Vue 3 allows you to perform type validation on props. This ensures that the props received from the parent component are of the expected type. In the props definition, you can specify the type using the JavaScript constructor. For example:

props: {
  message: {
    type: String,
    required: true
  }
}

In this example, the message prop is expected to be a string and is required.

1. Default Values: You can also provide default values for props. This is useful when a prop is not required and you want to provide a fallback value. For example:

props: {
  message: {
    type: String,
    default: 'Default message'
  }
}

In this example, if the message prop is not provided from the parent component, the default value 'Default message' will be used.

That's it! These are the steps involved in using props in Vue 3.