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docs: add some missing details around string coercion and handling of nullish values #15739

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document string coercion and handling of nullish values
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Rich-Harris committed Apr 11, 2025
commit ed263926e11e1f640690777681aa9a99605cf16c
2 changes: 2 additions & 0 deletions documentation/docs/03-template-syntax/01-basic-markup.md
Original file line number Diff line number Diff line change
Expand Up @@ -154,6 +154,8 @@ A JavaScript expression can be included as text by surrounding it with curly bra
{expression}
```

Expressions that are `null` or `undefined` will be omitted; all others are [coerced to strings](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String#string_coercion).

Curly braces can be included in a Svelte template by using their [HTML entity](https://developer.mozilla.org/docs/Glossary/Entity) strings: `{`, `{`, or `{` for `{` and `}`, `}`, or `}` for `}`.

If you're using a regular expression (`RegExp`) [literal notation](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp#literal_notation_and_constructor), you'll need to wrap it in parentheses.
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