Priority queues are useful for situations where you want to read or access data based on the order of importance instead of the order of being added. In this example, you need to set the priority to 6 or higher. To place an item at the front of the queue, you need to set the priority higher than the current highest set priority. The queue places the new item behind all existing items with the set priority of 3 or more. An item's set priority changes the order in which a queue reads itemsįor this example, an item with a set priority of 3 is being added to a queue. The item at the back of a priority queue has the default priority of 0, and the item at the front of the queue has the highest set priority, which is 5 in the following example. Priority queues are not following the FIFO rule, in which each item can be added with a priority number that indicates its order being read or removed. The order of how a regular queue adds, reads, and removes items Priority Queues Regular queues are maintained in the FIFO sequence, in which all items are added to the back of the queue and read or removed in the same order as they are added, from the front to the end. For any other usage, such as scheduling tasks and handling requests in your experience, you can use tables to implement queues on your own. Queue is a built-in data structure of the non-persistent data storage service named MemoryStoreService, for which you can directly call the built-in functions to get a queue and add, read, or remove data from the queue. Items in both types of queues can be any Luau data type. There are two types of queues on Roblox: regular queues, which follow the first-in-first-out (FIFO) principle, and priority queues, which have priorities for items in the queue that determine the data accessing order. A queue is a linear data structure with a collection of items.
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