Defining props and state

In Svelte, both props and state are used to manage data within components. Props are a way to pass data from a parent component to a child component. This makes the child component flexible and reusable, as it can get different data from the parent as needed.

On the other hand, state is data that is initialized and managed internally within a component, unlike props, which are received from an external source. State allows a component to be self-contained and modular.

Defining props

Let’s start with props. Props in Svelte are defined using the export keyword. When you export a variable in a Svelte component, it becomes a prop that you can pass data to from a parent component.

Here is a simple example:

<!-- file: Child.svelte -->
<script>
  export let message;
</script>
<h1>{message}</h1>

In the preceding code snippet, we defined a Svelte component in a file named Child.svelte. In the Svelte component...