JavaScript: Working with Two Arrays of Objects

Question

//Before
export const arr1 = [
    { addKey: '11', address: '12', value: 0 },
    { addKey: '11', address: '12', value: 0 },
    { addKey: '12', address: '11', value: 0 },
    { addKey: '12', address: '11', value: 0 },
]

export const arr2 = [
    {address: '11', value: 5, total: 0 },
    {address: '12', value: 10, total: 0 },
]

I want to create a function with arr1 & arr2 as arguments.

Where arr1.address == arr2.address => take arr2.value => Put in arr1.value

Sum the values by addKey then add to arr2.total

//After
export const arr1After = [
    { addKey: '11', address: '12', value: 10 },
    { addKey: '11', address: '12', value: 10 },
    { addKey: '12', address: '11', value: 5 },
    { addKey: '12', address: '11', value: 5 },
]

export const arr2After = [
    {address: '11', value: 5, total: 20 },
    {address: '12', value: 10, total: 10 },
]

are the values of address distinct in arr2After?

derpirscher
– derpirscher

2022-10-18 09:50:43 +00:00
Commented Oct 18, 2022 at 9:50 — derpirscher
– derpirscher, Commented Oct 18, 2022 at 9:50
As in they're all unique? If so yes.

valdimar.ein
– valdimar.ein

2022-10-18 09:53:30 +00:00
Commented Oct 18, 2022 at 9:53 — valdimar.ein
– valdimar.ein, Commented Oct 18, 2022 at 9:53

Drashti Kheni · Accepted Answer · 2022-10-18 09:51:30Z

1

Try this once:

//using for loop
const changeValue = (arr1, arr2) => {
   for (let i = 0; i < arr1.length; i++) {
    for (let j = 0; j < arr2.length; j++) {
      if (arr1[i].address === arr2[j].address) {
        arr1[i].value = arr2[j].value;
        arr2[j].total += arr2[j].value;
      }
    }
  }
  console.log(arr1, arr2);
};

//using foreach loop
const changeValue = (arr1, arr2) => {
   arr1.forEach((arr1Elem) => {
    arr2.forEach((arr2Elem) => {
      if (arr1Elem.address === arr2Elem.address) {
        arr1Elem.value = arr2Elem.value;
        arr2Elem.total += arr2Elem.value;
      }
    });
  });

  console.log(arr1, arr2);
};

changeValue(arr1, arr2);

edited Oct 18, 2022 at 9:51

answered Oct 18, 2022 at 9:48

Drashti Kheni

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2 Comments

derpirscher Over a year ago

This is missing the calculation of total ...

valdimar.ein Over a year ago

Thank you! That is super helpful! I had spent quite some time playing with this.

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