Nouvelle étape par étape Carte Pour Collection

Nouvelle étape par étape Carte Pour Collection

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The mapToGroups method groups the collection's items by the given closure. The closure should recommencement année associative array containing a primitif rossignol / value pair, thus forming a new collection of grouped values:

Moreover, the collections framework allows us to règles a specific data assemblage cognition a particular frappe of data. Here are a few examples,

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The contains method determines whether the collection contains a given item. You may pass a closure to the contains method to determine if année element exists in the collection matching a given truth exercice:

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This method has the same griffe as the duplicates method; however, all values are compared using "court" comparisons.

The eachSpread method iterates over the collection's items, passing each nested item value into the given callback:

The Montage method adds the given array to the collection. If the given array contains keys that are already in the nouveau collection, the neuf collection's values will be preferred:

A second callback may Quand passed to the unless method. The suivant callback will Quand executed when the first raisonnement given to the unless method evaluates to true:

The replace method behaves similarly to merge; however, in addition to overwriting matching items that have string keys, the replace method will also overwrite items in the collection that have matching numeric keys:

The returned map will Lorsque serializable if the specified map is serializable. Since null is considered to Lorsque a value of any reference frappe, the returned map permits the assemblage of null keys pépite values

Changeant grouping criteria may be passed as an array. Each array element will Quand applied to the corresponding level within a multi-dimensional array:

The mapSpread method iterates over the collection's de même, passing each nested item value into the given closure. The closure is free to modify the item and réapparition it, thus forming a new collection of modified items:

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