tap()
The tap method passes the collection to the given callback, allowing you to "tap" into the collection at a specific point and do something with the items while not affecting the collection itself:
collect([2, 4, 3, 1, 5])
.sort()
.tap(function(collection) {
console.log(collection.all());
//=> [1, 2, 3, 4, 5]
})
.shift();
//=> 1