How to use the zrender/src/core/util.createHashMap function in zrender

// dimension of data. But `data.encode` has higher priority.
    // Moreover, parallelModel.dimension should not be regarded as data
    // dimensions. Consider dimensions = ['dim4', 'dim2', 'dim6'];

    if (source.encodeDefine) {
        return;
    }

    var parallelModel = seriesModel.ecModel.getComponent(
        'parallel', seriesModel.get('parallelIndex')
    );
    if (!parallelModel) {
        return;
    }

    var encodeDefine = source.encodeDefine = createHashMap();
    each(parallelModel.dimensions, function (axisDim) {
        var dataDimIndex = convertDimNameToNumber(axisDim);
        encodeDefine.set(axisDim, dataDimIndex);
    });
}

function createSeriesStageTask(scheduler, stageHandler, stageHandlerRecord, ecModel, api) {
    var seriesTaskMap = stageHandlerRecord.seriesTaskMap
        || (stageHandlerRecord.seriesTaskMap = createHashMap());
    var seriesType = stageHandler.seriesType;
    var getTargetSeries = stageHandler.getTargetSeries;

    // If a stageHandler should cover all series, `createOnAllSeries` should be declared mandatorily,
    // to avoid some typo or abuse. Otherwise if an extension do not specify a `seriesType`,
    // it works but it may cause other irrelevant charts blocked.
    if (stageHandler.createOnAllSeries) {
        ecModel.eachRawSeries(create);
    }
    else if (seriesType) {
        ecModel.eachRawSeriesByType(seriesType, create);
    }
    else if (getTargetSeries) {
        getTargetSeries(ecModel, api).each(create);
    }

export default function (ecModel) {
    var stackInfoMap = createHashMap();
    ecModel.eachSeries(function (seriesModel) {
        var stack = seriesModel.get('stack');
        // Compatibal: when `stack` is set as '', do not stack.
        if (stack) {
            var stackInfoList = stackInfoMap.get(stack) || stackInfoMap.set(stack, []);
            var data = seriesModel.getData();

            var stackInfo = {
                // Used for calculate axis extent automatically.
                stackResultDimension: data.getCalculationInfo('stackResultDimension'),
                stackedOverDimension: data.getCalculationInfo('stackedOverDimension'),
                stackedDimension: data.getCalculationInfo('stackedDimension'),
                stackedByDimension: data.getCalculationInfo('stackedByDimension'),
                isStackedByIndex: data.getCalculationInfo('isStackedByIndex'),
                data: data,
                seriesModel: seriesModel

seriesModel, datasetModel, data, sourceFormat, seriesLayoutBy, completeResult
) {
    var coordSysDefine = getCoordSysDefineBySeries(seriesModel);
    var encode = {};
    // var encodeTooltip = [];
    // var encodeLabel = [];
    var encodeItemName = [];
    var encodeSeriesName = [];
    var seriesType = seriesModel.subType;

    // ??? TODO refactor: provide by series itself.
    // Consider the case: 'map' series is based on geo coordSys,
    // 'graph', 'heatmap' can be based on cartesian. But can not
    // give default rule simply here.
    var nSeriesMap = createHashMap(['pie', 'map', 'funnel']);
    var cSeriesMap = createHashMap([
        'line', 'bar', 'pictorialBar', 'scatter', 'effectScatter', 'candlestick', 'boxplot'
    ]);

    // Usually in this case series will use the first data
    // dimension as the "value" dimension, or other default
    // processes respectively.
    if (coordSysDefine && cSeriesMap.get(seriesType) != null) {
        var ecModel = seriesModel.ecModel;
        var datasetMap = inner(ecModel).datasetMap;
        var key = datasetModel.uid + '_' + seriesLayoutBy;
        var datasetRecord = datasetMap.get(key)
            || datasetMap.set(key, {categoryWayDim: 1, valueWayDim: 0});

        // TODO
        // Auto detect first time axis and do arrangement.
        each(coordSysDefine.coordSysDims, function (coordDim) {

function createOverallStageTask(scheduler, stageHandler, stageHandlerRecord, ecModel, api) {
    var overallTask = stageHandlerRecord.overallTask = stageHandlerRecord.overallTask
        // For overall task, the function only be called on reset stage.
        || createTask({reset: overallTaskReset});

    overallTask.context = {
        ecModel: ecModel,
        api: api,
        overallReset: stageHandler.overallReset,
        scheduler: scheduler
    };

    // Reuse orignal stubs.
    var agentStubMap = overallTask.agentStubMap = overallTask.agentStubMap || createHashMap();

    var seriesType = stageHandler.seriesType;
    var getTargetSeries = stageHandler.getTargetSeries;
    var overallProgress = true;
    var modifyOutputEnd = stageHandler.modifyOutputEnd;

    // An overall task with seriesType detected or has `getTargetSeries`, we add
    // stub in each pipelines, it will set the overall task dirty when the pipeline
    // progress. Moreover, to avoid call the overall task each frame (too frequent),
    // we set the pipeline block.
    if (seriesType) {
        ecModel.eachRawSeriesByType(seriesType, createStub);
    }
    else if (getTargetSeries) {
        getTargetSeries(ecModel, api).each(createStub);
    }

function normalizeDimensionsDefine(dimensionsDefine) {
    if (!dimensionsDefine) {
        // The meaning of null/undefined is different from empty array.
        return;
    }
    var nameMap = createHashMap();
    return map(dimensionsDefine, function (item, index) {
        item = extend({}, isObject(item) ? item : {name: item});

        // User can set null in dimensions.
        // We dont auto specify name, othewise a given name may
        // cause it be refered unexpectedly.
        if (item.name == null) {
            return item;
        }

        // Also consider number form like 2012.
        item.name += '';
        // User may also specify displayName.
        // displayName will always exists except user not
        // specified or dim name is not specified or detected.
        // (A auto generated dim name will not be used as

function Parallel(parallelModel, ecModel, api) {

    /**
     * key: dimension
     * @type {Object.}
     * @private
     */
    this._axesMap = zrUtil.createHashMap();

    /**
     * key: dimension
     * value: {position: [], rotation, }
     * @type {Object.}
     * @private
     */
    this._axesLayout = {};

    /**
     * Always follow axis order.
     * @type {Array.}
     * @readOnly
     */
    this.dimensions = parallelModel.dimensions;

function CoordSysInfo(coordSysName) {
  /**
   * @type {string}
   */
  this.coordSysName = coordSysName;
  /**
   * @type {Array.}
   */

  this.coordSysDims = [];
  /**
   * @type {module:zrender/core/util#HashMap}
   */

  this.axisMap = createHashMap();
  /**
   * @type {module:zrender/core/util#HashMap}
   */

  this.categoryAxisMap = createHashMap();
  /**
   * @type {number}
   */

  this.firstCategoryDimIndex = null;
}
/**