CODEWITHSUNDEEP
javascriptarraysreactjsalgorithm
Alisan26
Alisan26

Reputation: 323

Javascript array equality control and changing value

Hi I have two changeable length arrays and I tried If there is no value I want, delete it from that array and change the sum value if it has changed array 2 same serials code

array1 = [
    {
      "serial": "3",
      "sum": "1"
    },
    {
      "serial": "700",
      "sum": "2"
    },
    {
      "serial": "300",
      "sum": "1"
    },
]

array2 = [{
      "someting": 10,
      "sum": "3",
      "serialList": ["700","711"],
    },

   {
      "someting": 10,
      "sum": "1",
      "serialList": ["300"],
    },
    {
      "someting": 10,
      "sum": "2",
      "serialList": [],
    }
]

his my two array as I said arrays length is changeable sometimes array1 length big, sometimes array2 and I want If serial number in array1 does not exist in array2 delete from array1 element and change the sum value if it has changed array2 same serials code, according to above array1[0] serial codes does not exist and array1[1] sum value different array2[0] sum value change to sum value array1[1] to array2[0], serial number 300 to same sum number to array don't do anything I want to output array1 is:

array1 = [
    {
      "serial": "700",
      "sum": "3"
    },
    {
      "serial": "300",
      "sum": "1"
    },
]

Upvotes: 0

Views: 100

Answers (1)

Drew Reese
Drew Reese

Reputation: 202638

Using a flatMap

array1.flatMap(el => {
  // find array2 element with array1 element's serial
  const array2el = array2.find(({ serialList }) =>
    serialList.includes(el.serial)
  );
  if (array2el) {
    if (array2el.sum !== el.sum) {
      el.sum = array2el.sum; // sum different, update
    }
  } else {
    return []; // return [] to delete
  }
  return [el]; // return [el] to keep
});


const array1 = [
  {
    serial: "3",
    sum: "1"
  },
  {
    serial: "700",
    sum: "2"
  },
  {
    serial: "300",
    sum: "1"
  }
];

const array2 = [
  {
    someting: 10,
    sum: "3",
    serialList: ["700", "711"]
  },

  {
    someting: 10,
    sum: "1",
    serialList: ["300"]
  },
  {
    someting: 10,
    sum: "2",
    serialList: []
  }
];

const processedArray1 = array1.flatMap(el => {
  const array2el = array2.find(({ serialList }) =>
    serialList.includes(el.serial)
  );
  if (array2el) {
    if (array2el.sum !== el.sum) {
      el.sum = array2el.sum;
    }
  } else {
    return []; // delete
  }
  return [el]; // return el
});

console.log(processedArray1);

Using a reduce

const processedArray1 = array1.reduce((acc, el) => {
  // find array2 element with array1 element's serial
  const array2el = array2.find(({ serialList }) =>
    serialList.includes(el.serial)
  );
  if (array2el) {
    if (array2el.sum !== el.sum) {
      el.sum = array2el.sum; // sum different, update
    }
    acc.push(el); // push into filtered array if found in array2
  } 
  return acc;
}, []);


const array1 = [
  {
    serial: "3",
    sum: "1"
  },
  {
    serial: "700",
    sum: "2"
  },
  {
    serial: "300",
    sum: "1"
  }
];

const array2 = [
  {
    someting: 10,
    sum: "3",
    serialList: ["700", "711"]
  },

  {
    someting: 10,
    sum: "1",
    serialList: ["300"]
  },
  {
    someting: 10,
    sum: "2",
    serialList: []
  }
];

const processedArray1 = array1.reduce((acc, el) => {
  const array2el = array2.find(({ serialList }) =>
    serialList.includes(el.serial)
  );
  if (array2el) {
    if (array2el.sum !== el.sum) {
      el.sum = array2el.sum;
    }
    acc.push(el)
  } 
  return acc;
}, []);

console.log(processedArray1);

Upvotes: 1

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