whenEmpty()
The whenEmpty method will execute the given callback when the collection is empty:
js
const collection = collect([]);
collection.whenEmpty((c) => c.push('Mohamed Salah'));
collection.all();
// ['Mohamed Salah']js
const collection = collect(['Darwin Núñez']);
collection.whenEmpty(
(c) => c.push('Mohamed Salah'),
(c) => c.push('Xherdan Shaqiri')
);
collection.all();
// [
// 'Darwin Núñez',
// 'Xherdan Shaqiri',
// ];