# sole()
The sole method returns the first element in the collection that passes a given truth test, but only if the truth test matches exactly one element:
collect([1, 2, 3, 4]).sole(item => item === 1);
// 1
If there are no elements in the collection that should be returned by the sole method, then an error will be thrown:
collect([1, 2, 3, 4]).sole(item => item > 4);
// Error ('Item not found.') is thrown.
If there are multiple elements in the collection that should be returned by the sole method, then an error will be thrown:
collect([1, 2, 3, 4]).sole();
// Error ('Multiple items found.') is thrown.
Like the firstOrFail method, you may also pass an attribute, operator, and value:
const collection = collect([
{ product: 'Desk', price: 200, discounted: true },
{ product: 'Chair', price: 100, discounted: true },
{ product: 'Bookcase', price: 150, discounted: true },
{ product: 'Door', price: 100 },
]);
collection.sole('product', '=', 'Desk');
// { product: 'Desk', price: 200, discounted: true }