The concept of matryoshka logic applied to data manipulation

Question

The concept of matryoshka logic applied to data manipulation

"mainData"{
    entities:[]
},
"data2":{
    entities:[
        {
            name:"mainData":    //entites
        },
        {
            name:"mainData":    //entites
        },
        {
            name:"mainData":    //entites
        },
    ]
},
"data3":{
    entites:[
        {
            name:"data2":   //entites
        },
        {
            name:"data2":   //entites
        },
        {
            name:"data2":   //entites
        },
        {
            name:"data2":   //entites
        },]
}

I am looking to modify the data structure by adding a count to each object related to mainData. For example, in data2.entities there are 3 instances of mainData, so the count should be 3. Similarly, in data3.entities there are 4 data2s and since each data2 has 3 mainData inside it, the total count for data3 should be 12.

edit: How is the count for data3 12?

It is because there are 4 data2s in data3's entities, and each data2 has 3 mainData entries, resulting in a total count of 12 based on the mainData count.

The desired output structure would look like this:

"mainData"{
    entities:[]
},
"data2":{
count:3,
    entities:[
        {
            name:"mainData":    //entites
        },
        {
            name:"mainData":    //entites
        },
        {
            name:"mainData":    //entites
        },
    ]
},
"data3":{
count:12,
    entites:[
        {
            name:"data2":   //entites
        },
        {
            name:"data2":   //entites
        },
        {
            name:"data2":   //entites
        },
        {
            name:"data2":   //entites
        },]
}

javascript

Answer 1

Answer №1

If you need to calculate counts recursively:

const calculateCount = (data, name) => {
  if(name === "mainData") {
    return 1; // Base case: mainData has no nested entities, so count is 1
  } else {
    return data[name].entities.reduce((acc, entity) => (acc + calculateCount(data, entity.name)), 0);  // counts of nested entities
  }
}

// Calculate and add the count property to each data object
Object.keys(data).forEach(key => {
  data[key].count = calculateCount(data, key);
});

console.log(data);

<script>
  const data = {
    "mainData": {
      entities: []
    },
    "data2": {
      entities: [{
          name: "mainData"
        },
        {
          name: "mainData"
        },
        {
          name: "mainData"
        }
      ]
    },
    "data3": {
      entities: [{
          name: "data2"
        },
        {
          name: "data2"
        },
        {
          name: "data2"
        },
        {
          name: "data2"
        }
      ]
    }
  };
</script>

Answer 2

If you need to calculate counts recursively:

const calculateCount = (data, name) => {
  if(name === "mainData") {
    return 1; // Base case: mainData has no nested entities, so count is 1
  } else {
    return data[name].entities.reduce((acc, entity) => (acc + calculateCount(data, entity.name)), 0);  // counts of nested entities
  }
}

// Calculate and add the count property to each data object
Object.keys(data).forEach(key => {
  data[key].count = calculateCount(data, key);
});

console.log(data);

<script>
  const data = {
    "mainData": {
      entities: []
    },
    "data2": {
      entities: [{
          name: "mainData"
        },
        {
          name: "mainData"
        },
        {
          name: "mainData"
        }
      ]
    },
    "data3": {
      entities: [{
          name: "data2"
        },
        {
          name: "data2"
        },
        {
          name: "data2"
        },
        {
          name: "data2"
        }
      ]
    }
  };
</script>

Answer 3

Answer №2

If you want to achieve a similar result, you can utilize the following code snippet:

const obj = {
  "mainEntity": {
    items: []
  },
  "dataSet2": {
    items: [{
        name: "mainData"
      },
      {
        name: "mainData"
      },
      {
        name: "mainData"
      },
    ]
  },
  "dataSubset3": {
    items: [{
        name: "dataSet2"
      },
      {
        name: "dataSet2"
      },
      {
        name: "dataSet2"
      },
      {
        name: "dataSet2"
      },
    ]
  }
};

const calculateCountFor = (property) => {
  return obj[property].count = obj[property].items.reduce((accumulator, currentItem) => {
    let count;
    if (obj[currentItem.name].items.length === 0) {
      count = 1;
    } else if (typeof obj[currentItem.name].count !== 'undefined') {
      count = obj[currentItem.name].count;
    } else {
      count = calculateCountFor(currentItem.name);
    }
    return accumulator + count;
  }, 0)
}

Object.keys(obj).forEach((key) => {
  calculateCountFor(key);
});

console.log(obj);

This code snippet iterates through each object property's items array and calculates the respective count based on the conditions provided. If an item has no count and an empty items array, the count is set to 1. If there is no count and the items array is not empty, the count for that object is calculated first.

Answer 4

If you want to achieve a similar result, you can utilize the following code snippet:

const obj = {
  "mainEntity": {
    items: []
  },
  "dataSet2": {
    items: [{
        name: "mainData"
      },
      {
        name: "mainData"
      },
      {
        name: "mainData"
      },
    ]
  },
  "dataSubset3": {
    items: [{
        name: "dataSet2"
      },
      {
        name: "dataSet2"
      },
      {
        name: "dataSet2"
      },
      {
        name: "dataSet2"
      },
    ]
  }
};

const calculateCountFor = (property) => {
  return obj[property].count = obj[property].items.reduce((accumulator, currentItem) => {
    let count;
    if (obj[currentItem.name].items.length === 0) {
      count = 1;
    } else if (typeof obj[currentItem.name].count !== 'undefined') {
      count = obj[currentItem.name].count;
    } else {
      count = calculateCountFor(currentItem.name);
    }
    return accumulator + count;
  }, 0)
}

Object.keys(obj).forEach((key) => {
  calculateCountFor(key);
});

console.log(obj);

This code snippet iterates through each object property's items array and calculates the respective count based on the conditions provided. If an item has no count and an empty items array, the count is set to 1. If there is no count and the items array is not empty, the count for that object is calculated first.

Answer 5

Answer №3

A recursive method can be utilized to tally the nested elements.

To begin, develop a function that accepts an object and a key as inputs. This function will navigate through the object and calculate the occurrences of the key within the nested entities.

How does this function operate?

If the object is an array, loop through each element and invoke the function recursively.
If the object is an object with a property named name matching the key, increase the count.
If the object is an object with a property named entities, call the function recursively on the entities property and return the total count.

Here's a sample technique;

let data = {
   "mainData": {
       entities: []
   },
   "data2": {
       entities: [
           {
               name: "mainData"
           },
           {
               name: "mainData"
           },
           {
               name: "mainData"
           }
       ]
   },
   "data3": {
       entities: [
           {
               name: "data2"
           },
           {
               name: "data2"
           },
           {
               name: "data2"
           },
           {
               name: "data2"
           }
       ]
   }
};

function countEntities(obj, key) {
   let count = 0;

   if (Array.isArray(obj)) {
       for (let i = 0; i < obj.length; i++) {
           count += countEntities(obj[i], key);
       }
   } else if (typeof obj === 'object') {
       if (obj.name === key) {
           count++;
       }
       if (obj.entities) {
           count += countEntities(obj.entities, key);
       }
   }

   return count;
}
data.data2.count = countEntities(data.data2.entities, "mainData");
data.data3.count = countEntities(data.data3.entities, "data2") * 3;

console.log(data);

Answer 6

A recursive method can be utilized to tally the nested elements.

To begin, develop a function that accepts an object and a key as inputs. This function will navigate through the object and calculate the occurrences of the key within the nested entities.

How does this function operate?

If the object is an array, loop through each element and invoke the function recursively.
If the object is an object with a property named name matching the key, increase the count.
If the object is an object with a property named entities, call the function recursively on the entities property and return the total count.

Here's a sample technique;

let data = {
   "mainData": {
       entities: []
   },
   "data2": {
       entities: [
           {
               name: "mainData"
           },
           {
               name: "mainData"
           },
           {
               name: "mainData"
           }
       ]
   },
   "data3": {
       entities: [
           {
               name: "data2"
           },
           {
               name: "data2"
           },
           {
               name: "data2"
           },
           {
               name: "data2"
           }
       ]
   }
};

function countEntities(obj, key) {
   let count = 0;

   if (Array.isArray(obj)) {
       for (let i = 0; i < obj.length; i++) {
           count += countEntities(obj[i], key);
       }
   } else if (typeof obj === 'object') {
       if (obj.name === key) {
           count++;
       }
       if (obj.entities) {
           count += countEntities(obj.entities, key);
       }
   }

   return count;
}
data.data2.count = countEntities(data.data2.entities, "mainData");
data.data3.count = countEntities(data.data3.entities, "data2") * 3;

console.log(data);

The concept of matryoshka logic applied to data manipulation

Answer №1

Answer №2

Answer №3

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