Vue 2 How To Set Default Type Of Array In Props

Vue.js is a powerful framework that brings simplicity and flexibility to front-end development. One of its key features is the ability to pass data between parent and child components using props. In this guide, we'll focus on one specific aspect of props in Vue 2 - how to set the default type of an array in props.

By default, Vue treats props as any type of data. However, there are scenarios where you may want to enforce a specific type, such as an array, for a prop. This helps maintain consistency and readability in your codebase. To achieve this in Vue 2, you can make use of the `type` option when defining your prop.

Here's a step-by-step guide on how to set the default type of an array in props in Vue 2:

1. Define Your Component: Start by defining your Vue component. Within the component definition, you can declare the props that the component expects to receive. To set the default type of an array, you need to specify the `type` option as `Array`.

Vue.component('my-component', {
  props: {
    items: {
      type: Array,
      default: () => []
    }
  }
});

In the above code snippet, we have a component called `my-component` that expects an array prop named `items`. By setting `type: Array`, we ensure that Vue will throw a warning if the prop passed is not of type array.

2. Provide a Default Value: Additionally, you can provide a default value for the array prop. In the example above, we have set the default value to an empty array using the `default` option. This means that if the parent component does not supply the `items` prop, the component will use an empty array by default.

3. Accessing the Array in Your Component: Once you have set the default type of an array in props, you can access and manipulate the array within your component as needed. For example, you can iterate over the items in the array and render them in the component template.

<div>
    <ul>
      <li>{{ item.name }}</li>
    </ul>
  </div>



export default {
  props: {
    items: {
      type: Array,
      default: () =&gt; []
    }
  }
};

In the template section of your component, you can use Vue's `v-for` directive to iterate over the `items` array and render each item. This allows you to dynamically display the content of the array in the component.

In conclusion, setting the default type of an array in props in Vue 2 is a straightforward process that enhances the predictability and robustness of your components. By enforcing the type of data expected by your props, you can make your code more maintainable and easier to work with. Remember to provide a default value for the array prop to handle cases where the prop is not provided. Happy coding with Vue.js!