How to use double-ended-queue - 7 common examples

let pixelsToAdd = diffStartAndZeroed / diffFactor;
    // console.log(pixelsToAdd)

    // console.log(hoverTime, hoverTime.format(), pixelsToAdd);
    // console.log(Math.floor(leftOffset / gridWidth));

    //! offset grids needed since each zoom in won't be centered
    //! maybe non equal past/future dates - this.getDateArray(80, 40, timeScale, hoverTime);
    //! additional offset needed for midPoint and/or position
    let offSetGrids = Math.floor(leftOffset / gridWidth);

    // console.log(Math.floor(gridNumber/2), offSetGrids, gridNumber/2)
    //# MOST EXPENSIVE FUNCTION!!!! Greater the gridNumber === longer. 960 els ~23ms vs 100 at 3.5ms)
    let current = this.getDateArray(Math.floor(gridNumber/2), Math.floor(gridNumber/2), timeScale, hoverTime);
    // console.log(current)
    let deque = new Deque(current.dates);

    //# NEED FUNCTION TO CHECK IF DRAGGER IS WITHIN RANGE
    //# get front and back dates
    let frontDate = moment.utc(deque.peekFront().rawDate);
    let backDate = moment.utc(deque.peekBack().rawDate);
    // console.log(frontDate.format())
    // check if dragger date is between front/back dates, null set to ignore granularity (go to ms), [] for inclusive of front/back dates
    let isBetween = draggerDateActual.isBetween(frontDate, backDate, null, '[]');
    // let pixelsToAddToDragger = 0;
    let draggerPosition = 0;
    let draggerVisible = false;
    if (isBetween) {
      // let frontDateValue = moment.utc(frontDate.rawDate).valueOf(); // ZERO
      // let draggerPositionFromFront = draggerDateActualValue - frontDateValue;

      // pixelsToAddToDragger = Math.abs(frontDate.diff(draggerDateActual, timeScale, true) * gridWidth);

//# handle date array creation
    let current = this.getDateArray(Math.floor(gridNumber/2), Math.floor(gridNumber/2), timeScale, time);

    let frontDate = moment.utc(current.dates[0].rawDate);
    let draggerPosition = Math.abs(frontDate.diff(draggerTime, timeScale, true) * gridWidth);
    let draggerPositionB = Math.abs(frontDate.diff(moment.utc(draggerTimeStateBDraggerBTest), timeScale, true) * gridWidth);
    // this.addLine(initDateStart);
    // console.log(numberOfVisibleTiles, dragSentinelChangeNumber)

    // console.log(draggerPosition, pixelsToAdd, midPoint)
    // console.log(this.getDraggerPosition(draggerTimeStateBDraggerBTest, current.dates[0].rawDate, 'day', gridWidth))

    this.setState({
      compareMode: false,
      timeScaleSelectValue: timeScale,
      deque: new Deque(current.dates),
      // draggerPosition: draggerPosition + pixelsToAdd,
      draggerPosition: draggerPosition + midPoint - 49,
      draggerVisible: draggerVisible,
      draggerPositionB: draggerPositionB + midPoint - 49,
      draggerVisibleB: draggerVisibleB,
      redLineOffset: draggerPosition + pixelsToAdd + 49,
      numberOfVisibleTiles: numberOfVisibleTiles,
      dragSentinelChangeNumber: dragSentinelChangeNumber,
      axisWidth: axisWidth,
      timeScale: timeScale,
      selectedDate: time,
      // midTileDate: selectedDate.format(),
      currentDateRange: current.dates,
      gridWidth: gridWidth,
      draggerTimeState: time,
      draggerTimeStateB: draggerTimeStateBDraggerBTest,

export function serializeNodes(rootNodes: MagicalNode[]) {
  // because of circular references, we don't want to visit a node more than once
  let visitedNodes = new Set();

  let queue = new Deque(rootNodes);

  while (queue.length) {
    let currentNode = queue.shift()!;

    visitedNodes.add(currentNode);
    // console.log(currentNode);

    // we don't want to open any nodes deeper than 5 nodes by default
    let childPositionedNodes = getChildPositionedMagicalNodes({
      node: currentNode,
      path: []
    }).filter(({ node }) => !visitedNodes.has(node));

    queue.push(...childPositionedNodes.map(x => x.node));
  }
  let newNodes: HashedMagicalNode[] = [];

dbStore.set(name, sublevel(levelup(leveldown(name), opts, function (err) {
      /* istanbul ignore if */
      if (err) {
        dbStore.delete(name);
        return callback(err);
      }
      db = dbStore.get(name);
      db._docCount  = -1;
      db._queue = new Deque();
      /* istanbul ignore else */
      if (typeof opts.migrate === 'object') { // migration for leveldown
        opts.migrate.doMigrationOne(name, db, afterDBCreated);
      } else {
        afterDBCreated();
      }
    })));
  }

dbStore.set(name, sublevel(levelup(name, opts, function (err) {
      /* istanbul ignore if */
      if (err) {
        dbStore.delete(name);
        return callback(err);
      }
      db = dbStore.get(name);
      db._docCount  = -1;
      db._queue = new Deque();
      /* istanbul ignore else */
      if (opts.migrate) { // migration for leveldown
        migrate.toSublevel(name, db, afterDBCreated);
      } else {
        afterDBCreated();
      }
    })));
  }

dbStore.set(name, sublevel(levelup(name, opts, function (err) {
      /* istanbul ignore if */
      if (err) {
        dbStore.delete(name)
        return callback(err)
      }
      db = dbStore.get(name)
      db._docCount = -1
      db._queue = new Deque()
      afterDBCreated()
    })))
  }

constructor(maxPendingPromises = Infinity, maxQueuedPromises = Infinity) {
    this.pendingPromises = 0;
    this.maxPendingPromises = maxPendingPromises;
    this.maxQueuedPromises = maxQueuedPromises;
    this.queue = new Deque();
    this.length = 0;
  }