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Laravel 5 Collections: Reducing a Collection Into a Collection of Key/Collection-Value Pairs With mapToGroups
The mapToGroups method in PHP allows you to reduce a collection of data into key/value pairs. The resulting value for each key can be a single value or another collection. Compared to the mapToDictionary method, mapToGroups creates collections for each key's values instead of arrays. The mapToGroups method does not modify the original array and returns a new collection with a dictionary structure.
Laravel 5 Collections: Reducing a Collection to One Element With reduce
The reduce method is used to reduce a collection into a single item. It iterates over the collection and applies a callback function on each element. The method also provides an optional initial value parameter. The reduce method is similar to PHP's array_reduce function. Examples are provided to demonstrate the basic usage of the reduce method, including getting the sum and difference of elements in a collection. An example is also given to show how to get the product of each item in a collection.
Laravel 5 Collections: Reducing a Collection With User-Defined Keys With mapWithKeys
The mapWithKeys method in Laravel is used to associate keys and values based on a provided callback function. This method does not modify the original collection and returns a new collection. For example, you can use mapWithKeys to create a collection of products and their associated prices.
Laravel 5 Collections: Reducing a Multi-Dimensional Collection to a Single Dimension Losing Keys With flatten
The flatten method in Laravel's Collection class can be used to create a new collection instance that represents a flattened version of the original collection's items. This method does not preserve any keys from the original collection. The method also works with deeply nested arrays, as demonstrated in the example.
Laravel 5 Collections: Removing a Portion of a Collection With splice
The splice method in Laravel's Collection class allows you to remove a section of a collection and return the removed items as a new collection. It takes three parameters: $offset, $length, and $replacement. The $offset determines where to start removing items from the collection, and the $length controls how many items to remove. If provided, the $replacement parameter can be used to replace the removed items with new items.
Laravel 5 Collections: Removing Collection Elements With forget
The forget method in Laravel's Collection class removes an item from the collection based on a given key. It modifies the original collection instance and returns a reference to it. A code example demonstrates how to use the forget method to remove an item from a collection, either by passing a string key or a numerical key.
Laravel 5 Collections: Removing the First Element of a Collection With shift
The shift method in Laravel is used to remove the first item from a collection and return its value. It functions similar to PHP's array_shift function. An example use case is demonstrated where the method is used on a Collection instance to remove the first item.
Laravel 5 Collections: Retrieving a Portion of a Collection With slice
The slice method in Laravel is used to return a portion of a collection starting at a given offset. The offset determines where to start when creating the new collection, and it can be positive or negative to start from the end of the original collection. The method returns a new instance of the Collection class without modifying the original collection. The slice method is similar to PHP's array_slice function. There is also an optional length parameter that allows developers to control the size of the returned Collection. Additionally, developers can choose to preserve the keys of the returned collection by passing true as the argument for the preserveKeys parameter.
Laravel 5 Collections: Retrieving a Specified Number of Items From a Collection With take
The take method in Laravel's Collection class allows you to retrieve a specified number of items from the collection. By providing a positive limit, you can retrieve items from the beginning of the collection, whereas a negative limit will return items from the end. This method returns a new Collection instance and does not modify the original collection.
Laravel 5 Collections: Retrieving a Subset Of a Collections Elements With only
The only method in Laravel is used to return key/value pairs from a collection where the keys are present in the supplied $keys array. If $keys is null, a copy of the original collection is returned. For example, you can use only to retrieve only the first_name and last_name from a collection of users.
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