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从嵌套的 JS 对象中删除其属性后删除空对象

Cybernetic 发表于 Dev
10
控制论

我有一个嵌套的 JS 对象，如下所示：

data = {
    "name": "root",
    "children": [{
            "name": "bob",
            "children": []
        },
        {
            "name": "susan",
            "children": []
        },
        {
            "name": "chris",
            "children": []
        },
        {
            "name": "bobo",
            "children": []
        },
        {
            "name": "heather",
            "children": []
        }
    ]
}

通过使用以下递归函数，我可以删除任何属性，无论深度如何：

function search_and_delete(obj, search_term) {
    for (var k in obj) {
        if (typeof obj[k] == "object" && obj[k] !== null) {
            search_and_delete(obj[k], search_term)
        } else {
            if (typeof(obj.name) !== 'undefined') {
                if (obj.name === search_term) {
                    delete obj.name
                    delete obj.children
                }
            }
        }
    }
}

例如： 

search_and_delete(data, 'bob')

...产生以下结果： 

{
    "name": "root",
    "children": [
       {},   // <------ how do I remove this
       {
            "name": "susan",
            "children": []
       },
       {
            "name": "chris",
            "children": []
       },
       {
            "name": "bobo",
            "children": []
       },
       {
            "name": "heather",
            "children": []
       }
    ]
}

但这会在 bob 曾经所在的位置留下一个空对象。我怎样才能删除这个对象并重新索引 JSON 结构，就好像它从未存在过一样？

更新

@CertainPerformance 答案是最接近的，但会产生以下错误：

如果您使用此耀斑数据：

并运行以下命令： 

search_and_delete(data, "Interpolator", data)

它这样做：

在此处输入图片说明

某些表演

一种选择是将父数组传递给递归调用，以便您可以从中splice找到找到的项目。

因为改变数组会改变每个属性指向的内容，这将使其难以使用for..in- 用于Object.values迭代对象（或数组）：

const data = {
    "name": "root",
    "children": [{
            "name": "bob",
            "children": []
        },
        {
            "name": "susan",
            "children": []
        },
        {
            "name": "chris",
            "children": []
        },
        {
            "name": "bobo",
            "children": []
        },
        {
            "name": "heather",
            "children": []
        }
    ]
}

function search_and_delete(obj, search_term, parent) {
  if (obj.name === search_term) {
    parent.splice(parent.indexOf(obj), 1);
  } else {
    Object.values(obj).forEach((val) => {
      if (val && typeof val === "object") {
          search_and_delete(val, search_term, obj)
      }
    });
  }
}

search_and_delete(data, 'bob');
console.log(data);

将此用于更深结构的示例：

const data = {
 "name": "flare",
 "children": [
  {
   "name": "analytics",
   "children": [
    {
     "name": "cluster",
     "children": [
      {"name": "AgglomerativeCluster", "value": 3938},
      {"name": "CommunityStructure", "value": 3812},
      {"name": "HierarchicalCluster", "value": 6714},
      {"name": "MergeEdge", "value": 743}
     ]
    },
    {
     "name": "graph",
     "children": [
      {"name": "BetweennessCentrality", "value": 3534},
      {"name": "LinkDistance", "value": 5731},
      {"name": "MaxFlowMinCut", "value": 7840},
      {"name": "ShortestPaths", "value": 5914},
      {"name": "SpanningTree", "value": 3416}
     ]
    },
    {
     "name": "optimization",
     "children": [
      {"name": "AspectRatioBanker", "value": 7074}
     ]
    }
   ]
  },
  {
   "name": "animate",
   "children": [
    {"name": "Easing", "value": 17010},
    {"name": "FunctionSequence", "value": 5842},
    {
     "name": "interpolate",
     "children": [
      {"name": "ArrayInterpolator", "value": 1983},
      {"name": "ColorInterpolator", "value": 2047},
      {"name": "DateInterpolator", "value": 1375},
      {"name": "Interpolator", "value": 8746},
      {"name": "MatrixInterpolator", "value": 2202},
      {"name": "NumberInterpolator", "value": 1382},
      {"name": "ObjectInterpolator", "value": 1629},
      {"name": "PointInterpolator", "value": 1675},
      {"name": "RectangleInterpolator", "value": 2042}
     ]
    },
    {"name": "ISchedulable", "value": 1041},
    {"name": "Parallel", "value": 5176},
    {"name": "Pause", "value": 449},
    {"name": "Scheduler", "value": 5593},
    {"name": "Sequence", "value": 5534},
    {"name": "Transition", "value": 9201},
    {"name": "Transitioner", "value": 19975},
    {"name": "TransitionEvent", "value": 1116},
    {"name": "Tween", "value": 6006}
   ]
  },
  {
   "name": "data",
   "children": [
    {
     "name": "converters",
     "children": [
      {"name": "Converters", "value": 721},
      {"name": "DelimitedTextConverter", "value": 4294},
      {"name": "GraphMLConverter", "value": 9800},
      {"name": "IDataConverter", "value": 1314},
      {"name": "JSONConverter", "value": 2220}
     ]
    },
    {"name": "DataField", "value": 1759},
    {"name": "DataSchema", "value": 2165},
    {"name": "DataSet", "value": 586},
    {"name": "DataSource", "value": 3331},
    {"name": "DataTable", "value": 772},
    {"name": "DataUtil", "value": 3322}
   ]
  },
  {
   "name": "display",
   "children": [
    {"name": "DirtySprite", "value": 8833},
    {"name": "LineSprite", "value": 1732},
    {"name": "RectSprite", "value": 3623},
    {"name": "TextSprite", "value": 10066}
   ]
  },
  {
   "name": "flex",
   "children": [
    {"name": "FlareVis", "value": 4116}
   ]
  },
  {
   "name": "physics",
   "children": [
    {"name": "DragForce", "value": 1082},
    {"name": "GravityForce", "value": 1336},
    {"name": "IForce", "value": 319},
    {"name": "NBodyForce", "value": 10498},
    {"name": "Particle", "value": 2822},
    {"name": "Simulation", "value": 9983},
    {"name": "Spring", "value": 2213},
    {"name": "SpringForce", "value": 1681}
   ]
  },
  {
   "name": "query",
   "children": [
    {"name": "AggregateExpression", "value": 1616},
    {"name": "And", "value": 1027},
    {"name": "Arithmetic", "value": 3891},
    {"name": "Average", "value": 891},
    {"name": "BinaryExpression", "value": 2893},
    {"name": "Comparison", "value": 5103},
    {"name": "CompositeExpression", "value": 3677},
    {"name": "Count", "value": 781},
    {"name": "DateUtil", "value": 4141},
    {"name": "Distinct", "value": 933},
    {"name": "Expression", "value": 5130},
    {"name": "ExpressionIterator", "value": 3617},
    {"name": "Fn", "value": 3240},
    {"name": "If", "value": 2732},
    {"name": "IsA", "value": 2039},
    {"name": "Literal", "value": 1214},
    {"name": "Match", "value": 3748},
    {"name": "Maximum", "value": 843},
    {
     "name": "methods",
     "children": [
      {"name": "add", "value": 593},
      {"name": "and", "value": 330},
      {"name": "average", "value": 287},
      {"name": "count", "value": 277},
      {"name": "distinct", "value": 292},
      {"name": "div", "value": 595},
      {"name": "eq", "value": 594},
      {"name": "fn", "value": 460},
      {"name": "gt", "value": 603},
      {"name": "gte", "value": 625},
      {"name": "iff", "value": 748},
      {"name": "isa", "value": 461},
      {"name": "lt", "value": 597},
      {"name": "lte", "value": 619},
      {"name": "max", "value": 283},
      {"name": "min", "value": 283},
      {"name": "mod", "value": 591},
      {"name": "mul", "value": 603},
      {"name": "neq", "value": 599},
      {"name": "not", "value": 386},
      {"name": "or", "value": 323},
      {"name": "orderby", "value": 307},
      {"name": "range", "value": 772},
      {"name": "select", "value": 296},
      {"name": "stddev", "value": 363},
      {"name": "sub", "value": 600},
      {"name": "sum", "value": 280},
      {"name": "update", "value": 307},
      {"name": "variance", "value": 335},
      {"name": "where", "value": 299},
      {"name": "xor", "value": 354},
      {"name": "_", "value": 264}
     ]
    },
    {"name": "Minimum", "value": 843},
    {"name": "Not", "value": 1554},
    {"name": "Or", "value": 970},
    {"name": "Query", "value": 13896},
    {"name": "Range", "value": 1594},
    {"name": "StringUtil", "value": 4130},
    {"name": "Sum", "value": 791},
    {"name": "Variable", "value": 1124},
    {"name": "Variance", "value": 1876},
    {"name": "Xor", "value": 1101}
   ]
  },
  {
   "name": "scale",
   "children": [
    {"name": "IScaleMap", "value": 2105},
    {"name": "LinearScale", "value": 1316},
    {"name": "LogScale", "value": 3151},
    {"name": "OrdinalScale", "value": 3770},
    {"name": "QuantileScale", "value": 2435},
    {"name": "QuantitativeScale", "value": 4839},
    {"name": "RootScale", "value": 1756},
    {"name": "Scale", "value": 4268},
    {"name": "ScaleType", "value": 1821},
    {"name": "TimeScale", "value": 5833}
   ]
  },
  {
   "name": "util",
   "children": [
    {"name": "Arrays", "value": 8258},
    {"name": "Colors", "value": 10001},
    {"name": "Dates", "value": 8217},
    {"name": "Displays", "value": 12555},
    {"name": "Filter", "value": 2324},
    {"name": "Geometry", "value": 10993},
    {
     "name": "heap",
     "children": [
      {"name": "FibonacciHeap", "value": 9354},
      {"name": "HeapNode", "value": 1233}
     ]
    },
    {"name": "IEvaluable", "value": 335},
    {"name": "IPredicate", "value": 383},
    {"name": "IValueProxy", "value": 874},
    {
     "name": "math",
     "children": [
      {"name": "DenseMatrix", "value": 3165},
      {"name": "IMatrix", "value": 2815},
      {"name": "SparseMatrix", "value": 3366}
     ]
    },
    {"name": "Maths", "value": 17705},
    {"name": "Orientation", "value": 1486},
    {
     "name": "palette",
     "children": [
      {"name": "ColorPalette", "value": 6367},
      {"name": "Palette", "value": 1229},
      {"name": "ShapePalette", "value": 2059},
      {"name": "SizePalette", "value": 2291}
     ]
    },
    {"name": "Property", "value": 5559},
    {"name": "Shapes", "value": 19118},
    {"name": "Sort", "value": 6887},
    {"name": "Stats", "value": 6557},
    {"name": "Strings", "value": 22026}
   ]
  },
  {
   "name": "vis",
   "children": [
    {
     "name": "axis",
     "children": [
      {"name": "Axes", "value": 1302},
      {"name": "Axis", "value": 24593},
      {"name": "AxisGridLine", "value": 652},
      {"name": "AxisLabel", "value": 636},
      {"name": "CartesianAxes", "value": 6703}
     ]
    },
    {
     "name": "controls",
     "children": [
      {"name": "AnchorControl", "value": 2138},
      {"name": "ClickControl", "value": 3824},
      {"name": "Control", "value": 1353},
      {"name": "ControlList", "value": 4665},
      {"name": "DragControl", "value": 2649},
      {"name": "ExpandControl", "value": 2832},
      {"name": "HoverControl", "value": 4896},
      {"name": "IControl", "value": 763},
      {"name": "PanZoomControl", "value": 5222},
      {"name": "SelectionControl", "value": 7862},
      {"name": "TooltipControl", "value": 8435}
     ]
    },
    {
     "name": "data",
     "children": [
      {"name": "Data", "value": 20544},
      {"name": "DataList", "value": 19788},
      {"name": "DataSprite", "value": 10349},
      {"name": "EdgeSprite", "value": 3301},
      {"name": "NodeSprite", "value": 19382},
      {
       "name": "render",
       "children": [
        {"name": "ArrowType", "value": 698},
        {"name": "EdgeRenderer", "value": 5569},
        {"name": "IRenderer", "value": 353},
        {"name": "ShapeRenderer", "value": 2247}
       ]
      },
      {"name": "ScaleBinding", "value": 11275},
      {"name": "Tree", "value": 7147},
      {"name": "TreeBuilder", "value": 9930}
     ]
    },
    {
     "name": "events",
     "children": [
      {"name": "DataEvent", "value": 2313},
      {"name": "SelectionEvent", "value": 1880},
      {"name": "TooltipEvent", "value": 1701},
      {"name": "VisualizationEvent", "value": 1117}
     ]
    },
    {
     "name": "legend",
     "children": [
      {"name": "Legend", "value": 20859},
      {"name": "LegendItem", "value": 4614},
      {"name": "LegendRange", "value": 10530}
     ]
    },
    {
     "name": "operator",
     "children": [
      {
       "name": "distortion",
       "children": [
        {"name": "BifocalDistortion", "value": 4461},
        {"name": "Distortion", "value": 6314},
        {"name": "FisheyeDistortion", "value": 3444}
       ]
      },
      {
       "name": "encoder",
       "children": [
        {"name": "ColorEncoder", "value": 3179},
        {"name": "Encoder", "value": 4060},
        {"name": "PropertyEncoder", "value": 4138},
        {"name": "ShapeEncoder", "value": 1690},
        {"name": "SizeEncoder", "value": 1830}
       ]
      },
      {
       "name": "filter",
       "children": [
        {"name": "FisheyeTreeFilter", "value": 5219},
        {"name": "GraphDistanceFilter", "value": 3165},
        {"name": "VisibilityFilter", "value": 3509}
       ]
      },
      {"name": "IOperator", "value": 1286},
      {
       "name": "label",
       "children": [
        {"name": "Labeler", "value": 9956},
        {"name": "RadialLabeler", "value": 3899},
        {"name": "StackedAreaLabeler", "value": 3202}
       ]
      },
      {
       "name": "layout",
       "children": [
        {"name": "AxisLayout", "value": 6725},
        {"name": "BundledEdgeRouter", "value": 3727},
        {"name": "CircleLayout", "value": 9317},
        {"name": "CirclePackingLayout", "value": 12003},
        {"name": "DendrogramLayout", "value": 4853},
        {"name": "ForceDirectedLayout", "value": 8411},
        {"name": "IcicleTreeLayout", "value": 4864},
        {"name": "IndentedTreeLayout", "value": 3174},
        {"name": "Layout", "value": 7881},
        {"name": "NodeLinkTreeLayout", "value": 12870},
        {"name": "PieLayout", "value": 2728},
        {"name": "RadialTreeLayout", "value": 12348},
        {"name": "RandomLayout", "value": 870},
        {"name": "StackedAreaLayout", "value": 9121},
        {"name": "TreeMapLayout", "value": 9191}
       ]
      },
      {"name": "Operator", "value": 2490},
      {"name": "OperatorList", "value": 5248},
      {"name": "OperatorSequence", "value": 4190},
      {"name": "OperatorSwitch", "value": 2581},
      {"name": "SortOperator", "value": 2023}
     ]
    },
    {"name": "Visualization", "value": 16540}
   ]
  }
 ]
};



function search_and_delete(obj, search_term, parent) {
  if (obj.name === search_term) {
    parent.splice(parent.indexOf(obj), 1);
  } else {
    Object.values(obj).forEach((val) => {
      if (val && typeof val === "object") {
          search_and_delete(val, search_term, obj)
      }
    });
  }
}

search_and_delete(data, "Interpolator") 
console.log(data);

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