CODEWITHSUNDEEP
javascriptarraysobjectstate
Anders Kitson
Anders Kitson

Reputation: 1545

I have two arrays with objects inside that I want to compare the values and return the change key value pait and array position

I want to compare these two arryays and output the key value pairs of the changed value so the out put should be like so only the changed object is in a new array, and if there were other changed objects they would be in order with there changed fields. and I always want the col10 id to be present.

Thanks ahead of time

I have tried the following

 oldState.map((item, i) => {
        saveData.map((item1, j) => {
          if (item[`col${i}`] === item1[`col${j}`]) {
            console.log(item1);
          }
        });
      });

desired result of comaparison of two arrays

[
  {col0:"snappy", col10:"292959180223939085"}
]

var oldState = 

[
  {
    "col0": "Decor",
    "col1": "2021-03-31",
    "col2": "okok",
    "col3": true,
    "col4": 7,
    "col5": 5,
    "col6": "Curation",
    "col7": "fsaf",
    "col8": "https://res.cloudinary.com/kitson-co/image/upload/v1615646495/catalog/sse5zxtklsj3ib730zjy.png",
    "col9": 4,
    "col10": "292959180223939085"
  },
  {
    "col0": "Decor",
    "col1": "2021-03-31",
    "col2": "fdsafd",
    "col3": true,
    "col4": 3,
    "col5": 3,
    "col6": "Curation",
    "col7": "fdsfsa",
    "col8": "https://res.cloudinary.com/kitson-co/image/upload/v1615657360/catalog/qpudbgkrvftjlo5c1yma.png",
    "col9": 5,
    "col10": "292970573359743501"
  }
]

var saveData = 

[
  {
    "col0": "Snappy",
    "col1": "2021-03-31",
    "col2": "okok",
    "col3": true,
    "col4": 7,
    "col5": 5,
    "col6": "Curation",
    "col7": "fsaf",
    "col8": "https://res.cloudinary.com/kitson-co/image/upload/v1615646495/catalog/sse5zxtklsj3ib730zjy.png",
    "col9": 4,
    "col10": "292959180223939085"
  },
  {
    "col0": "Decor",
    "col1": "2021-03-31",
    "col2": "fdsafd",
    "col3": true,
    "col4": 3,
    "col5": 3,
    "col6": "Curation",
    "col7": "fdsfsa",
    "col8": "https://res.cloudinary.com/kitson-co/image/upload/v1615657360/catalog/qpudbgkrvftjlo5c1yma.png",
    "col9": 5,
    "col10": "292970573359743501"
  }
]

What i get after trying the answer

enter image description here

Upvotes: 1

Views: 66

Answers (1)

a.mola
a.mola

Reputation: 4011

I mapped the the oldState and saveData arrays to return an array [old, new] for each pair. Then created the function to return key and value pair with the different values

Provided both versions of the object have the same keys.

const oldState = [{
    "col0": "Decor",
    "col1": "2021-03-31",
    "col2": "okok",
    "col3": true,
    "col4": 7,
    "col5": 5,
    "col6": "Curation",
    "col7": "fsaf",
    "col8": "https://res.cloudinary.com/kitson-co/image/upload/v1615646495/catalog/sse5zxtklsj3ib730zjy.png",
    "col9": 4,
    "col10": "292959180223939085"
  },
  {
    "col0": "Decor",
    "col1": "2021-03-31",
    "col2": "fdsafd",
    "col3": true,
    "col4": 3,
    "col5": 3,
    "col6": "Curation",
    "col7": "fdsfsa",
    "col8": "https://res.cloudinary.com/kitson-co/image/upload/v1615657360/catalog/qpudbgkrvftjlo5c1yma.png",
    "col9": 5,
    "col10": "292970573359743501"
  }
]

const saveData = [{
    "col0": "Snappy",
    "col1": "2021-03-31",
    "col2": "okok",
    "col3": true,
    "col4": 7,
    "col5": 5,
    "col6": "Curation",
    "col7": "fsaf",
    "col8": "https://res.cloudinary.com/kitson-co/image/upload/v1615646495/catalog/sse5zxtklsj3ib730zjy.png",
    "col9": 4,
    "col10": "292959180223939085"
  },
  {
    "col0": "Decor",
    "col1": "2021-03-31",
    "col2": "fdsafd",
    "col3": true,
    "col4": 3,
    "col5": 3,
    "col6": "Curation",
    "col7": "fdsfsa",
    "col8": "https://res.cloudinary.com/kitson-co/image/upload/v1615657360/catalog/qpudbgkrvftjlo5c1yma.png",
    "col9": 5,
    "col10": "292970573359743501"
  }
]

function compareArray(oldItem, newItem) {
  const compared = {};

  for (const key in oldItem) {
    if ((key == 'col10' || oldItem[key] != newItem[key]) && Object.hasOwnProperty.call(newItem, key) && Object.hasOwnProperty.call(oldItem, key)) {
      compared[key] = newItem[key];
    }
  }

  return compared;
}

oldState.map((old, i) => [old, saveData[i]]).forEach((item) => console.log(compareArray(...item)));

Upvotes: 1

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