Did you know you can dump a collection at any point? Learn all about dump() in this lesson.
each() & eachSpread()
Passing a collection to a callback function is easy when you use the each() method. For better code readability, use the eachSpread().
When you need to filter a collection by a key or a set of keys, the only() method is what you are looking for. Pass in 'null' to bypass the entire operation. Learn all about it in this video.
The nth() method is a great helper for filtering your collection by a given number of steps. It even has an extra parameter to offset the collection.