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free-stack

v1.0.7

Published

Free-stack is a stack that also behave like a queue. You can push/pop on top, but you can also push/pop on bottom. You can even look for items in the middle, and move them up or down. It's all free! just like this package.

Downloads

7

Readme

free-stack

npm version

Free stack provides a freeform stack / queue implemented as a Double Linked-List.

You can use it as:

  • a stack
  • a queue
  • a free stack, which is both a stack and a queue. It goes both ways
  • a set, that's fine too
  • you also have commands like moveToTop, moveToBottom. It's useful, trust me!

Notes

  • All operations are O(1), because the list has an internal hashmap for finding items by value.
  • In case you're still worried about performance, it also uses an ObjectPool to optimize on allocations.
  • Oh, and it's built on top of Bun, so you know it comes out fast and delicious!

Use case

Free stack is used mainly as a priority queue for bun-engine. The first-in / first-out allows us to process a window of cells, and eliminate the old ones (so that we don't have to store too many cells in memory). But one particular use case is that we could encounter a cell that we're already handling. In that case, that cell is no longer "old", so we put it back in front of the queue.

Usage

const freeStack: FreeStack<string> = new DoubleLinkList("");

freeStack.pushTop("item1");
freeStack.pushBottom("bottom");
freeStack.moveToBottom("item2");
const item = freeStack.popBottom();
//  result => item = "item1";
//  ...

//  You can also use the more traditional structures, but if you really need a queue / stack, I suggest you just use an array. That's more efficient.

const stack = freeStack;
stack.pushTop("something");
const something = stack.popTop();  //  <= returns "something"

Github Source

https://github.com/jacklehamster/free-stack/