The fastest javascript implementation of a double-ended queue. Maintains compatability with deque. 

The fastest javascript implementation of a double-ended queue. Used by the official Redis, MongoDB, MariaDB & MySQL libraries for Node.js and many other libraries. Maintains compatability with deque.

salakar

denque

The fastest javascript implementation of a double-ended queue. Maintains compatability with deque.

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 * Custom implementation of a double ended queue.

   * Returns the item at the specified index from the list.

   * 0 is the first element, 1 is the second, and so on...

   * Elements at negative values are that many from the end: -1 is one before the end

   * (the last element), -2 is two before the end (one before last), etc.

    // expect a number or return undefined

    if (i >= len || i < -len) return undefined;

    i = (this._head + i) & this._capacityMask;

   * Returns the first item in the list without removing it.

    if (this._head === this._tail) return undefined;

   * Returns the item that is at the back of the queue without removing it.

   * Returns the current length of the queue

   * Return the number of items on the list, or 0 if empty.

    if (this._head === this._tail) return 0;

    if (this._head < this._tail) return this._tail - this._head;

    else return this._capacityMask + 1 - (this._head - this._tail);

    this._head = (head + 1) & this._capacityMask;

    if (head < 2 && this._tail > 10000 && this._tail <= this._list.length >>> 2) this._shrinkArray();

   * Add an item to the bottom of the list.

    if (item === undefined) return this.length;

    this._tail = (tail + 1) & this._capacityMask;

   * Remove and return the last item on the list.

   * Returns undefined if the list is empty.

    if (tail === this._head) return undefined;

    this._tail = (tail - 1 + len) & this._capacityMask;

    if (this._head < 2 && tail > 10000 && tail <= len >>> 2) this._shrinkArray();

   * Soft clear - does not reset capacity.

   * Returns true or false whether the list is empty.

   * Returns an array of all queue items.

   * Fills the queue with items from an array

    for (let i = 0; i < array.length; i++) this.push(array[i]);

    if (fullCopy || this._head > this._tail) {

      for (i = this._head; i < len; i++) newArray.push(list[i]);

      for (i = 0; i < this._tail; i++) newArray.push(list[i]);

      for (i = this._head; i < this._tail; i++) newArray.push(list[i]);

      // copy existing data, head to end, then beginning to tail.

      this._list = this._copyArray(true);

    // head is at 0 and array is now full, safe to extend

    this._capacityMask = (this._capacityMask << 1) | 1;

  "description": "The fastest javascript implementation of a double-ended queue. Maintains compatability with deque.",

    "test": "istanbul cover --report lcov _mocha",

    "coveralls": "cat ./coverage/lcov.info | coveralls",

    "benchmark_thousand": "node benchmark/thousand",

    "benchmark_two_million": "node benchmark/two_million"

    "url": "git+https://github.com/Salakar/denque.git"

    "url": "https://github.com/Salakar/denque/issues"

  "homepage": "https://github.com/Salakar/denque#readme",

		@@ -124,2 +124,3 @@ 'use strict';
		const item = this._list[head];
		this._list[head] = undefined;
		this._head = (head + 1) & this._capacityMask;
		@@ -158,2 +159,3 @@ if (head < 2 && this._tail > 10000 && this._tail <= this._list.length >>> 2) this._shrinkArray();
		const item = this._list[this._tail];
		this._list[this._tail] = undefined;
		if (this._head < 2 && tail > 10000 && tail <= len >>> 2) this._shrinkArray();
		@@ -160,0 +162,0 @@ return item;

		{
		"name": "denque",
		"version": "1.0.3",
		"version": "1.0.4",
		"description": "The fastest javascript implementation of a double-ended queue. Maintains compatability with deque.",
		@@ -5,0 +5,0 @@ "main": "index.js",

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