25 lines
511 B
Markdown
25 lines
511 B
Markdown
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---
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title: setIfUnset()
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---
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```js
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Attributes attributes.setIfUnset(string key, string value)
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```
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Sets the attribute identified by `key` to value `value` but only if it's currently unset (`undefined`).
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<Tip>
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This will never overwrite any value and thus is a safe way to set attributes
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</Tip>
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```js
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let { Path, paths } = part.shorthand();
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// This will render as: class="classA"
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paths.demo = new Path();
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paths.demo.attributes.set('class', 'classA');
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paths.demo.attributes.setIfUnset('class', 'classB');
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```
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