Replace or update the current array of objects that align with the incoming array

Question

Replace or update the current array of objects that align with the incoming array

I've been struggling to figure out how to find and replace an array that matches the existing one. The issue lies with using the some method.

Here is the current array:

let existingData = [{
    id: 1,
    product: 'Soap',
    price: '$2'
},{
    id: 2,
    product: 'Sofa',
    price: '$30'
},{
    id: 3,
    product: 'Chair',
    price: '$45'
}]

And here is the incoming array:

const updateData = [{
    id: 1,
    product: 'Soap',
    price: '$3'
},{
    id: 2,
    product: 'Sofa',
    price: '$35'
}]

I have considered using the forEach method, but I'm unsure of how to handle it when dealing with arrays. This has resulted in me getting stuck and unable to move forward.

const updateData = [{
    id: 1,
    product: 'Soap',
    price: '$3'
},{
    id: 2,
    product: 'Sofa',
    price: '$35'
}]

existingData.forEach(d=>{
    if(d.id === ??? how can I match this to the incoming array?)
    // If there is a match, update the existing data with the updated one.
})

The expected result should resemble this:

let existingData = [{
    id: 1,
    product: 'Soap',
    price: '$3'
},{
    id: 2,
    product: 'Sofa',
    price: '$35'
},{
    id: 3,
    product: 'Chair',
    price: '$45'
}]

If, in certain cases, the data is not found in existingData, then simply add the incoming array to the existing array.

I would appreciate any guidance on how to achieve this or if there is a more efficient solution available. Thank you!

javascript arrays

Answer 1

Answer №1

To achieve the desired outcome, you can make use of forEach along with find

let existingData = [{
    id: 1,
    product: "Soap",
    price: "$2",
  },
  {
    id: 2,
    product: "Sofa",
    price: "$30",
  },
  {
    id: 3,
    product: "Chair",
    price: "$45",
  },
];

const updateData = [{
    id: 1,
    product: "Soap",
    price: "$3",
  },
  {
    id: 2,
    product: "Sofa",
    price: "$35",
  },
];

updateData.forEach((obj) => {
  let isExist = existingData.find((o) => o.id === obj.id);
  if (isExist) {
    isExist.price = obj.price;
    isExist.product = obj.product;
  }
});

console.log(existingData);

If there are multiple properties that require updating, you can utilize a for..in loop to iterate over the updated object and replace the corresponding property in the existing data.

updateData.forEach((obj) => {
  let isExist = existingData.find((o) => o.id === obj.id);
  if (isExist) {
    for (let prop in obj) {
      isExist[prop] = obj[prop];
    }
  }
});

If you wish to add new data items that do not currently exist in the existing array, you can simply push them into the existingData array.

let existingData = [{
    id: 1,
    product: "Soap",
    price: "$2",
  },
  {
    id: 2,
    product: "Sofa",
    price: "$30",
  },
  {
    id: 3,
    product: "Chair",
    price: "$45",
  },
];

const updateData = [{
    id: 1,
    product: "Soap",
    price: "$3",
  },
  {
    id: 2,
    product: "Sofa",
    price: "$35",
  },
  {
    id: 6,
    product: "Sofa",
    price: "$135",
  },
];

updateData.forEach((obj) => {
  let isExist = existingData.find((o) => o.id === obj.id);
  if (isExist) {
    for (let prop in obj) {
      isExist[prop] = obj[prop];
    }
  } else {
    existingData.push(obj);
  }
});

console.log(existingData);

Answer 2

To achieve the desired outcome, you can make use of forEach along with find

let existingData = [{
    id: 1,
    product: "Soap",
    price: "$2",
  },
  {
    id: 2,
    product: "Sofa",
    price: "$30",
  },
  {
    id: 3,
    product: "Chair",
    price: "$45",
  },
];

const updateData = [{
    id: 1,
    product: "Soap",
    price: "$3",
  },
  {
    id: 2,
    product: "Sofa",
    price: "$35",
  },
];

updateData.forEach((obj) => {
  let isExist = existingData.find((o) => o.id === obj.id);
  if (isExist) {
    isExist.price = obj.price;
    isExist.product = obj.product;
  }
});

console.log(existingData);

If there are multiple properties that require updating, you can utilize a for..in loop to iterate over the updated object and replace the corresponding property in the existing data.

updateData.forEach((obj) => {
  let isExist = existingData.find((o) => o.id === obj.id);
  if (isExist) {
    for (let prop in obj) {
      isExist[prop] = obj[prop];
    }
  }
});

If you wish to add new data items that do not currently exist in the existing array, you can simply push them into the existingData array.

let existingData = [{
    id: 1,
    product: "Soap",
    price: "$2",
  },
  {
    id: 2,
    product: "Sofa",
    price: "$30",
  },
  {
    id: 3,
    product: "Chair",
    price: "$45",
  },
];

const updateData = [{
    id: 1,
    product: "Soap",
    price: "$3",
  },
  {
    id: 2,
    product: "Sofa",
    price: "$35",
  },
  {
    id: 6,
    product: "Sofa",
    price: "$135",
  },
];

updateData.forEach((obj) => {
  let isExist = existingData.find((o) => o.id === obj.id);
  if (isExist) {
    for (let prop in obj) {
      isExist[prop] = obj[prop];
    }
  } else {
    existingData.push(obj);
  }
});

console.log(existingData);

Answer 3

Answer №2

Iterating through the existingData array, each existingItem is checked against the updatedDate array to find a matching item by id. If a match is found, the product and price properties of the existingItem are updated with those from the matching item in the updatedDate array.

Answer 4

Iterating through the existingData array, each existingItem is checked against the updatedDate array to find a matching item by id. If a match is found, the product and price properties of the existingItem are updated with those from the matching item in the updatedDate array.

Answer 5

Answer №3

To update your data based on the existingData and updateData, you can follow this simple process:

// Create a temporary object that maps updated objects' ids to their new ids
const updateDataByKeys = Object.fromEntries(updateData.map(e => [e.id, e]));

// Iterate through `existingData`, replacing old entries with the updated ones where they exist in the temporary object,
// otherwise retain the old object.
const newData = existingData.map(e => updateDataByKeys[e.id] || e);

Building the temporary object will yield better performance compared to using .find() on updateData.

If you want to merge the data from updateData into the existing objects as well, you can do the following:

const newData = existingData.map(
  e => updateDataByKeys[e.id] ? ({...e, ...updateDataByKeys[e.id]}) : e
);

UPDATE: As per feedback, if you also need to incorporate new objects from updateData:


// Create a temporary object that maps updated objects' ids to the new ids
const updateDataByKeys = Object.fromEntries(updateData.map(e => [e.id, e]));

// Iterate through `existingData`, replacing old entries with updated ones where they
// match in the temporary object. Remove the updated objects from the mapping;
// then concatenate any remaining new data (that were not present in the old data) to the list.
const newData = existingData.map(e => {
    if(updateDataByKeys[e.id]) {
        const val = updateDataByKeys[e.id];
        delete updateDataByKeys[e.id];
        return val;
    }
    return e;
}).concat(Object.values(updateDataByKeys));

Answer 6

To update your data based on the existingData and updateData, you can follow this simple process:

// Create a temporary object that maps updated objects' ids to their new ids
const updateDataByKeys = Object.fromEntries(updateData.map(e => [e.id, e]));

// Iterate through `existingData`, replacing old entries with the updated ones where they exist in the temporary object,
// otherwise retain the old object.
const newData = existingData.map(e => updateDataByKeys[e.id] || e);

Building the temporary object will yield better performance compared to using .find() on updateData.

If you want to merge the data from updateData into the existing objects as well, you can do the following:

const newData = existingData.map(
  e => updateDataByKeys[e.id] ? ({...e, ...updateDataByKeys[e.id]}) : e
);

UPDATE: As per feedback, if you also need to incorporate new objects from updateData:


// Create a temporary object that maps updated objects' ids to the new ids
const updateDataByKeys = Object.fromEntries(updateData.map(e => [e.id, e]));

// Iterate through `existingData`, replacing old entries with updated ones where they
// match in the temporary object. Remove the updated objects from the mapping;
// then concatenate any remaining new data (that were not present in the old data) to the list.
const newData = existingData.map(e => {
    if(updateDataByKeys[e.id]) {
        const val = updateDataByKeys[e.id];
        delete updateDataByKeys[e.id];
        return val;
    }
    return e;
}).concat(Object.values(updateDataByKeys));

Replace or update the current array of objects that align with the incoming array

Answer №1

Answer №2

Answer №3

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