Count duplicates within an Array of Objects, return Unique Entries

duplicates.js

const data = [
  { a: { animal: "dog" } },
  { a: { animal: "dog" } },
  { b: { animal: "dog" } },
  { a: { animal: "dog" } },
  { b: { animal: "puppy" } },
  { c: { animal: "dog" } },
];

function countDuplicates(originalArray) {
  var compressedArrayData = [];
  const arrayCopy = originalArray.slice(0);

  for (var i = 0; i < originalArray.length; i++) {
    var counter = 0;
    for (var j = 0; j < arrayCopy.length; j++) {
      let originalArrayItemKey = Object.keys(originalArray[i])[0];
      let arrayCopyItemKey = Object.keys(arrayCopy[j])[0];

      if (originalArrayItemKey === arrayCopyItemKey) {
        counter++;
      }
    }

    if (counter > 0) {
      var revisedFormat = new Object();
      revisedFormat.value = originalArray[i];
      revisedFormat.validName = Object.keys(originalArray[i])[0];
      revisedFormat.count = counter;
      compressedArrayData.push(revisedFormat);
    }
  }

  return compressedArrayData;
}

const validatedValues = countDuplicates(data);

console.log(validatedValues);

//Get unique pairs
//Here i have used validName to filter

let uniqueAssignment = validatedValues.filter(
  (uniqueAssignment, index, self) =>
    index ===
    self.findIndex(
      (t) =>
        t.validName === uniqueAssignment.validName &&
        t.validName === uniqueAssignment.validName
    )
);
console.log(uniqueAssignment);

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