What about forPage(), get() and forget() methods in Collect.js?

Collect.js - Interview Questions

forPage() : The forPage() method returns a new collection containing the items that would be present on a given page number. The method accepts the page number as its first argument and the number of items to show per page as its second argument:

const collection = collect([1, 2, 3, 4, 5, 6, 7, 8, 9]);

const forPage = collection.forPage(2, 3);

forPage.all();

// [4, 5, 6]

get() : The get() method returns the item at a given key or index. If the key or index does not exist, null is returned:

const collection = collect({
  firstname: 'Mohamed',
  lastname: 'Salah',
});

collection.get('lastname');

// Salah

collection.get('middlename');

// null
const collection = collect(['a', 'b', 'c']);

collection.get(1);

// b

You may optionally pass a default value as the second argument:

const collection = collect({
  firstname: 'Mohamed',
  lastname: 'Salah',
});

collection.get('middlename', 'default-value');
// default-value

You may even pass a callback as the default value. The result of the callback will be returned if the specified key does not exist:

const collection = collect({
  firstname: 'Mohamed',
  lastname: 'Salah',
});

collection.get('middlename', () => 'default-value');

// default-value

forget() : The forget() method removes an item from the collection by its key:

const collection = collect({
  name: 'Darwin Núñez',
  number: 27,
});

collection.forget('number');

collection.all();

// {
//   name: 'Darwin Núñez',
// }

Unlike most other collection methods, forget does not return a new modified collection; it modifies the collection it is called on.