Javascript - Iterate Nested Object based on each Index

abhijitbakshi
April 30, 2024
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2 Answers

const networkChart = NodeClassification;
  const itemKey = Object.values(networkChart).map((x) => Object.keys(x)[0])
  const itemKey1 = Object.values(networkChart).map((x) => Object.values(x)[0])

  itemKey1.map((item, index) => {
    return (
    item.group = itemKey[index],
    item.Vendor = Object.keys(networkChart)[index]
    )
  })

  // itemKey1.map((item, index) => {
  //   item.group = itemKey[index].toUpperCase()
  // })

  const netArr = itemKey1?.map((data, index) => {
    return {
      "group": data.group,
      "key": data.Vendor,
      "value": data.DownCount
    }
  })

Below "NodeClassification" having nested object in each object having there item objects which I need to break this to form array of object. Result of array of object as shown below to from a structure with new key & existing values.
Below attached the bar need to form in this structure on array of object.

JSON Object Structure:
    "NodeClassification": {
             "Mobile": {
                "NORMAL": {
                   "DownCount": 2
                },
                "VIP": {
                   "DownCount": 2
                }
             },
             "MobileRAN": {
                "NORMAL": {
                   "DownCount": 4
                },
                 "VIP": {
                       "DownCount": 4
                    },
                "CRITICAL": {
                       "DownCount": 4
                    }
             }
          }
        
    Result I need based on Array Of Object Structure:
    [{
        group: 'NORMAL',
        key: 'Mobile',
        value: 2
      },
      {
        group: 'VIP',
        key: 'Mobile',
        value: 2
      },
      {
        group: 'NORMAL',
        key: 'MobileRAN',
        value: 4
      },
      {
        group: 'VIP',
        key: 'MobileRAN',
        value: 4
      },
      {
        group: 'CRITICAL',
        key: 'MobileRAN',
        value: 4
      }
    ]

Answers

A combination of Object#entries and Array#reduce could help:

const input={NodeClassification:{Mobile:{NORMAL:{DownCount:2},VIP:{DownCount:2}},MobileRAN:{NORMAL:{DownCount:4},VIP:{DownCount:4},CRITICAL:{DownCount:4}}}};

const result = Object.entries(input.NodeClassification)
  .reduce((r, [group, obj]) => (
    Object.entries(obj).forEach(([key, {DownCount: value}]) => r.push({group, key, value})
  ), r), []);
  
console.log(result);

Smaller but a bit less performant:

const input={NodeClassification:{Mobile:{NORMAL:{DownCount:2},VIP:{DownCount:2}},MobileRAN:{NORMAL:{DownCount:4},VIP:{DownCount:4},CRITICAL:{DownCount:4}}}};

const result = Object.entries(input.NodeClassification)
  .reduce((r, [group, obj]) => r.concat(Object.entries(obj).map(([key, {DownCount: value}]) => ({group, key, value}))), []);
  
console.log(result);

More smaller but more less performant (due iterators in Array#flatMap:

const input={NodeClassification:{Mobile:{NORMAL:{DownCount:2},VIP:{DownCount:2}},MobileRAN:{NORMAL:{DownCount:4},VIP:{DownCount:4},CRITICAL:{DownCount:4}}}};

const result = Object.entries(input.NodeClassification)
  .flatMap(([group, obj]) => Object.entries(obj).map(([key, {DownCount: value}]) => ({group, key, value})));
  
console.log(result);

You could get the entries and map the nested entries.

const
    data = { NodeClassification: { Mobile: { NORMAL: { DownCount: 2 }, VIP: { DownCount: 2 } }, MobileRAN: { NORMAL: { DownCount: 4 }, VIP: { DownCount: 4 }, CRITICAL: { DownCount: 4 } } } },
    result = Object
        .entries(data.NodeClassification)
        .flatMap(([key, o]) => Object
            .entries(o)
            .map(([group, { DownCount: value }]) => ({ group, key, value }))
        );

console.log(result);

.as-console-wrapper { max-height: 100% !important; top: 0; }

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Javascript – Iterate Nested Object based on each Index

Answers