atleast one of the value's in the array1 obj "data" array matches the "data" array in array2 object

Question

at least one of the value's in the array1 obj "data" array matches the "data" array in array2 object


> array1

array1 = [
  {
      id: '1',
      name: 'ron',
      data: ['p1']
  },
  {
      id: '2',
      name: 'lon',
      data: ['p2']
  },
{
      id: '3',
      name: 'voon',
      data: ['p4']
  }
];


> array2

array2 = [
  {
      id: '1',
      name: 'fgr',
      data:['p1','p2','p3']
  },
  {
      id: '2',
      name: 'gone',
      data:['p1','p2','p3']
  }
]

output: { id: '1', name: 'ron', data: ['p1'] }, { id: '2', name: 'lon', data: ['p2'] }

https://stackoverflow.com/questions/33356504/difference-and-intersection-of-two-arrays-containing-objects — K Scandrett, Jan 29 '22 at 10:56

score 0 · Accepted Answer · answered Jan 29 '22 at 12:51

With the below assumption:

array1 has objects each of which always have prop data which is an array
array2 also has objects and these objects will always have prop data which is an array as well
the desired objective is to generate an array with objects from array1 whose data have at least one common element with any of the data of array2 objects.

this solution may work:

const findNeedleInHaystack = (needle = array1, haystack = array2) => (
    needle.reduce((acc, itm) => (
      haystack
      .map(x => x.data)
      .flat()
      .some(x => itm.data.includes(x))
        ? [...acc, itm]
        : [...acc]
    ), [])
);

Explanation

iterate over the needle array (ie, array1) using .reduce
use .map on haystack array (ie, array2) to separate the data from each object
use .flat() to transform the 2-dimensional resulting array into 1-dimension
use .some to see if any element in the 1-dimensional array is also present in itm's data array
if found, concatenate itm to the result (using ... spread operator on acc - the aggregator/accumulator)
if not found, skip concatenating itm.

Code Snippet

const array1 = [
  {
      id: '1',
      name: 'ron',
      data: ['p1']
  },
  {
      id: '2',
      name: 'lon',
      data: ['p2']
  },
{
      id: '3',
      name: 'voon',
      data: ['p4']
  }
];

const array2 = [
  {
      id: '1',
      name: 'fgr',
      data:['p1','p2','p3']
  },
  {
      id: '2',
      name: 'gone',
      data:['p1','p2','p3']
  }
];

const findNeedleInHaystack = (needle = array1, haystack = array2) => (
    needle.reduce((acc, itm) => (
    haystack.map(x => x.data).flat().some(x => itm.data.includes(x))
        ? [...acc, itm]
      : [...acc]
  ), [])
);

console.log(findNeedleInHaystack());

atleast one of the value's in the array1 obj "data" array matches the "data" array in array2 object

1 Answers1