Exploring the concept of 'Abstract classes' within the Svelte framework

As someone who is relatively new to Svelte and frontend development (with primary experience in Rust/C++/Python), I hope you can forgive me for asking what might seem like a basic question.

My goal is to showcase different kinds of time-indexed data, with a user-editable "timestamp" variable. I aim to exhibit the relevant item from each dataset based on the provided timestamp.

For instance, let's consider temperature and rainfall readings as my datasets:

interface Temperature {
temperature: number
}
interface Rainfall {
rainfall: number
}
A = [{"timestamp" : 0, "temperature": 20}, {"timestamp": 1, "temperature": 25}, {"timestamp" : 2, "temperature": 28}]   
B = [{"timestamp" : 0, "rainfall": 200}, {"timestamp" :1, "rainfall": 210}, {"timestamp": 2, "rainfall": 220}]

I have created Svelte components for Temperature and Rainfall that align with the respective Typescript interfaces. However, I am unsure how to abstract the fact that each data type has a timestamp and a unique way of displaying itself as a Svelte component. In an object-oriented language, I would typically use an abstract class with a display() method to return the appropriate Svelte component.

Is there a method within Svelte or JavaScript to craft universal code that selects the relevant datum from a list based on the timestamp and then showcases it using the corresponding Svelte component?

Thank you for your assistance.

Answer №1

To showcase the data in a component, consider adding a property and displaying it using <svelte:component>. However, if the data is fetched from a server, this approach may not work.

An alternative method would be to use a mapping with a type property. For example:

interface Temperature {
  type: 'temperature';
  temperature: number;
}
interface Rainfall {
  type: 'rainfall';
  rainfall: number;
}

type Datum = Temperature | Rainfall;
<script lang="ts">
  // ...
  import TemperatureComponent from '...';
  import RainfallComponent from '...';

  export let item: Datum;

  const displayMapping: Record<Datum['type'], SvelteComponent> = {
    temperature: TemperatureComponent,
    rainfall: RainfallComponent,
  }
</script>

<svelte:component this={displayMapping[item.type]} {...item} />

Another option is to utilize an {#if}/{:else if} chain based on the type.

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