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

echarts.registerPreprocessor(function (option) {
    if (!option) {
        return;
    }

    var dataZoomOpts = option.dataZoom || (option.dataZoom = []);
    if (!zrUtil.isArray(dataZoomOpts)) {
        option.dataZoom = dataZoomOpts = [dataZoomOpts];
    }

    var toolboxOpt = option.toolbox;
    if (toolboxOpt) {
        // Assume there is only one toolbox
        if (zrUtil.isArray(toolboxOpt)) {
            toolboxOpt = toolboxOpt[0];
        }

        if (toolboxOpt && toolboxOpt.feature) {
            var dataZoomOpt = toolboxOpt.feature.dataZoom;
            // FIXME: If add dataZoom when setOption in merge mode,
            // no axis info to be added. See `test/dataZoom-extreme.html`
            addForAxis('xAxis', dataZoomOpt);
            addForAxis('yAxis', dataZoomOpt);

echarts.registerPreprocessor(function (option) {
  var graphicOption = option.graphic; // Convert
  // {graphic: [{left: 10, type: 'circle'}, ...]}
  // or
  // {graphic: {left: 10, type: 'circle'}}
  // to
  // {graphic: [{elements: [{left: 10, type: 'circle'}, ...]}]}

  if (zrUtil.isArray(graphicOption)) {
    if (!graphicOption[0] || !graphicOption[0].elements) {
      option.graphic = [{
        elements: graphicOption
      }];
    } else {
      // Only one graphic instance can be instantiated. (We dont
      // want that too many views are created in echarts._viewMap)
      option.graphic = [option.graphic[0]];
    }
  } else if (graphicOption && !graphicOption.elements) {
    option.graphic = [{
      elements: [graphicOption]
    }];
  }
}); // ------
// Model

var scaleType = scale.type;
  var min = model.getMin();
  var max = model.getMax();
  var fixMin = min != null;
  var fixMax = max != null;
  var originalExtent = scale.getExtent();
  var axisDataLen;
  var boundaryGap;
  var span;

  if (scaleType === 'ordinal') {
    axisDataLen = model.getCategories().length;
  } else {
    boundaryGap = model.get('boundaryGap');

    if (!zrUtil.isArray(boundaryGap)) {
      boundaryGap = [boundaryGap || 0, boundaryGap || 0];
    }

    if (typeof boundaryGap[0] === 'boolean') {
      boundaryGap = [0, 0];
    }

    boundaryGap[0] = numberUtil.parsePercent(boundaryGap[0], 1);
    boundaryGap[1] = numberUtil.parsePercent(boundaryGap[1], 1);
    span = originalExtent[1] - originalExtent[0] || Math.abs(originalExtent[0]);
  } // Notice: When min/max is not set (that is, when there are null/undefined,
  // which is the most common case), these cases should be ensured:
  // (1) For 'ordinal', show all axis.data.
  // (2) For others:
  //      + `boundaryGap` is applied (if min/max set, boundaryGap is
  //      disabled).

VisualMapping.prepareVisualTypes = function (visualTypes) {
    if (isObject(visualTypes)) {
        var types = [];
        each(visualTypes, function (item, type) {
            types.push(type);
        });
        visualTypes = types;
    }
    else if (zrUtil.isArray(visualTypes)) {
        visualTypes = visualTypes.slice();
    }
    else {
        return [];
    }

    visualTypes.sort(function (type1, type2) {
        // color should be front of colorSaturation, colorAlpha, ...
        // symbol and symbolSize do not matter.
        return (type2 === 'color' && type1 !== 'color' && type1.indexOf('color') === 0)
            ? 1 : -1;
    });

    return visualTypes;
};

function layout(graphs, opts) {
  if (!zrUtil.isArray(graphs)) {
    graphs = [graphs];
  }

  var graph0 = graphs[0];
  var groups = []; // Init groups

  graph0.eachNode(function (node) {
    var group = {
      size: 0,
      subGroups: [],
      node: node
    };
    groups.push(group);
  });
  zrUtil.each(graphs, function (graph) {
    graph.eachEdge(function (edge) {

function mergeAndNormalizeLayoutParams(target, raw) {
    // Normalize cellSize
    var cellSize = target.cellSize;

    if (!zrUtil.isArray(cellSize)) {
        cellSize = target.cellSize = [cellSize, cellSize];
    }
    else if (cellSize.length === 1) {
        cellSize[1] = cellSize[0];
    }

    var ignoreSize = zrUtil.map([0, 1], function (hvIdx) {
        // If user have set `width` or both `left` and `right`, cellSize
        // will be automatically set to 'auto', otherwise the default
        // setting of cellSize will make `width` setting not work.
        if (sizeCalculable(raw, hvIdx)) {
            cellSize[hvIdx] = 'auto';
        }
        return cellSize[hvIdx] != null && cellSize[hvIdx] !== 'auto';
    });

function createSymbol(name, lineData, idx) {
    var color = lineData.getItemVisual(idx, 'color');
    var symbolType = lineData.getItemVisual(idx, name);
    var symbolSize = lineData.getItemVisual(idx, name + 'Size');

    if (!symbolType || symbolType === 'none') {
        return;
    }

    if (!zrUtil.isArray(symbolSize)) {
        symbolSize = [symbolSize, symbolSize];
    }
    var symbolPath = symbolUtil.createSymbol(
        symbolType, -symbolSize[0] / 2, -symbolSize[1] / 2,
        symbolSize[0], symbolSize[1], color
    );

    symbolPath.name = name;

    return symbolPath;
}

export function queryDataIndex(data, payload) {
  if (payload.dataIndexInside != null) {
    return payload.dataIndexInside;
  } else if (payload.dataIndex != null) {
    return zrUtil.isArray(payload.dataIndex) ? zrUtil.map(payload.dataIndex, function (value) {
      return data.indexOfRawIndex(value);
    }) : data.indexOfRawIndex(payload.dataIndex);
  } else if (payload.name != null) {
    return zrUtil.isArray(payload.name) ? zrUtil.map(payload.name, function (value) {
      return data.indexOfName(value);
    }) : data.indexOfName(payload.name);
  }
}
/**

function normalizeDimensions(dimensions) {
    if (!zrUtil.isArray(dimensions)) {
        dimensions = [dimensions];
    }
    return dimensions;
}

function normalizeSymbolSize(symbolSize) {
  if (!zrUtil.isArray(symbolSize)) {
    symbolSize = [+symbolSize, +symbolSize];
  }

  return symbolSize;
}