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docs: clarify default prop behaviour (#4460) #64

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Feb 28, 2020
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docs: clarify default prop behaviour (#4460) #64

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6 changes: 3 additions & 3 deletions site/content/docs/01-component-format.md
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Expand Up @@ -42,13 +42,13 @@ Svelte uses the `export` keyword to mark a variable declaration as a *property*

---

You can specify a default value, which will be used if the component's consumer doesn't specify a prop.
You can specify a default initial value for a prop. It will be used if the component's consumer doesn't specify the prop on the component (or if its initial value is `undefined`) when instantiating the component. Note that whenever a prop is removed by the consumer, its value is set to `undefined` rather than the initial value.

In development mode (see the [compiler options](docs#svelte_compile)), a warning will be printed if no default is provided and the consumer does not specify a value. To squelch this warning, ensure that a default is specified, even if it is `undefined`.
In development mode (see the [compiler options](docs#svelte_compile)), a warning will be printed if no default initial value is provided and the consumer does not specify a value. To squelch this warning, ensure that a default initial value is specified, even if it is `undefined`.

```html
<script>
export let bar = 'optional default value';
export let bar = 'optional default initial value';
export let baz = undefined;
</script>
```
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