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Helen Durrant 2018-09-08 21:40:11 +02:00 • committed by GitHub
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# Arrays # Arrays
Objects allow to store keyed collections of values. That's fine. Objects allow you to store keyed collections of values. That's fine.
But quite often we find that we need an *ordered collection*, where we have a 1st, a 2nd, a 3rd element and so on. For example, we need that to store a list of something: users, goods, HTML elements etc. But quite often we find that we need an *ordered collection*, where we have a 1st, a 2nd, a 3rd element and so on. For example, we need that to store a list of something: users, goods, HTML elements etc.
@ -121,7 +121,7 @@ A stack is usually illustrated as a pack of cards: new cards are added to the to
For stacks, the latest pushed item is received first, that's also called LIFO (Last-In-First-Out) principle. For queues, we have FIFO (First-In-First-Out). For stacks, the latest pushed item is received first, that's also called LIFO (Last-In-First-Out) principle. For queues, we have FIFO (First-In-First-Out).
Arrays in JavaScript can work both as a queue and as a stack. They allow to add/remove elements both to/from the beginning or the end. Arrays in JavaScript can work both as a queue and as a stack. They allow you to add/remove elements both to/from the beginning or the end.
In computer science the data structure that allows it is called [deque](https://en.wikipedia.org/wiki/Double-ended_queue). In computer science the data structure that allows it is called [deque](https://en.wikipedia.org/wiki/Double-ended_queue).
@ -431,7 +431,7 @@ alert( "1,2" + 1 ); // "1,21"
## Summary ## Summary
Array is a special kind of objects, suited to store and manage ordered data items. Array is a special kind of object, suited to storing and managing ordered data items.
- The declaration: - The declaration: