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

has()

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

<Signature code={has(collection, key): boolean;} />

A functional alternative to collection.has(key) which will also work with plain Objects and Arrays as an alternative for collection.hasOwnProperty(key).

<Repl defaultValue={has(['dog', 'frog', 'cat'], 2);} /> <Repl defaultValue={has(['dog', 'frog', 'cat'], 5);} /> <Repl defaultValue={has({ x: 123, y: 456 }, 'x');} /> <Repl defaultValue={has({ x: 123, y: 456 }, 'z');} />