isDeepDataStructureEquality.js

// see ... [https://stackoverflow.com/questions/71015428/how-to-get-the-intersection-of-two-sets-while-recognizing-equal-set-values-items/71016510#71016510]
//
// How to get the intersection of two sets while recognizing
// equal set values/items not only by reference but by their
// equal structures and entries too?

// see also ... [https://stackoverflow.com/questions/76512735/javascript-check-if-arrays-within-an-array-are-the-same]
//
// Javascript - Check if arrays within an array are the same

function isDeepDataStructureEquality(a, b) {
  let isEqual = Object.is(a, b);

  if (!isEqual) {
    if (Array.isArray(a) && Array.isArray(b)) {

      isEqual = (a.length === b.length) && a.every(
        (item, idx) => isDeepDataStructureEquality(item, b[idx])
      );
    } else if (
      a && b
      && (typeof a === 'object')
      && (typeof b === 'object')
    ) {
      const aKeys = Object.keys(a);
      const bKeys = Object.keys(b);

      isEqual = (aKeys.length === bKeys.length) && aKeys.every(
        (key, idx) => isDeepDataStructureEquality(a[key], b[key])
      );
    }
  }
  return isEqual;
}