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title: isConcrete()
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---

# isConcrete()

Returns `true` if the component is concrete, or `false` otherwise. A concrete component is a sub-component in an inheritance chain.

## Signature

`isConcrete()`

## Returns

**Type: `Boolean`** Returns `true` if the component is concrete, or `false` otherwise.

**See Also**  


-   [getConcreteComponent()](https://developer.salesforce.com/docs/platform/aura-platform/guide/ref-jsapi-component-getconcretecomponent.md)
-   [Favor Composition Over Inheritance](https://developer.salesforce.com/docs/platform/aura-platform/oo/oo-favor-composition.md)