githubmirror/immutable-js

website/docs/hasIn().mdx

13 строк493 B

Julien Deniau

Doc as mdx instead of export from .d.ts file (#2104)

24 май 2025, 00:47

24 май 2025, 00:4721de701

import Repl from '@/repl/Repl.tsx';
import CodeLink from '@/mdx-components/CodeLink.tsx';

# hasIn()

Returns true if the key path is defined in the provided collection.

A functional alternative to `collection.hasIn(keypath)` which will also work with plain Objects and Arrays.

<Signature code={`hasIn(collection, keyPath): boolean;`} />

<Repl defaultValue={`hasIn({ x: { y: { z: 123 } } }, ['x', 'y', 'z']);`} />
<Repl defaultValue={`hasIn({ x: { y: { z: 123 } } }, ['x', 'q', 'p']);`} />