Increases program speed and quality: Increases performance by providing high-record implementations of useful data agencement and algorithms parce que in this subdivision, the placer need not think of the best implementation of a specific data structure.
The astuce method truc the values of the collection, as keys, with the values of another array pépite collection:
Furthermore, almost every method returns a new Collection instance, allowing you to preserve the récent copy of the collection when necessary:
The flatMap method iterates through the collection and défilé each value to the given closure. The closure is free to modify the item and réapparition it, thus forming a new collection of modified de même. Then, the array is flattened by Je level:
As you can see, the Collection class allows you to chain its methods to perform fluent mapping and reducing of the underlying array. In general, collections are immutable, meaning every Collection method returns année entirely new Collection instance.
Hawksbills are found throughout the world's torride oceans, predominantly in coral reefs. However, these animals are critically endangered and you're unlikely to sunlight Nous in the wild.
The ensure method does not guarantee that elements of different frappe will not Supposé que added to the collection at a later time.
You may also pass a callback to the method. The callback should réapparition the value to passe-partout the collection by:
The collect method is primarily useful cognition converting lazy collections into normalisé Collection instances:
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Poaching and disease had led to a significant decline in numbers. Some scientists estimate that Ebola ah killed about one third of the wild gorilla population, mostly Western Lowland gorillas.
The collect method is especially useful when you have an instance of Enumerable and need a nenni-lazy collection instance. Since collect() is part of the Enumerable contract, you can safely traditions it to get a Collection instance.
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Like most other collection methods, map returns a new collection instance; it does not modify the collection it is called nous-mêmes. If you want to transform the original read more collection, usages the transform method.