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 array

Solution 1:

Using a flatMap

array1.flatMap(el => {
  // find array2 element with array1 element's serialconst 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 serialconst 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);