Consider an array of objects where duplicates need to be eliminated based on a specific property:

const dataSet = [
  { id: '01', name: 'Lele' },
  { id: '02', name: 'Bobo' },
  { id: '03', name: 'Taotao' },
  { id: '04', name: 'Haha' },
  { id: '01', name: 'Lele' }
];

Method 1: Using an Object Lookup

This approach employs an object as a lookup table to track encountered keys.

function removeDuplicatesByProperty(arr, property) {
  const uniqueItems = [];
  const seenKeys = {};
  
  for (let i = 0; i < arr.length; i++) {
    const currentKey = arr[i][property];
    if (!seenKeys[currentKey]) {
      uniqueItems.push(arr[i]);
      seenKeys[currentKey] = true;
    }
  }
  
  return uniqueItems;
}

const deduped = removeDuplicatesByProperty(dataSet, 'id');
console.log(deduped);
// Output: [{id: "01", name: "Lele"}, {id: "02", name: "Bobo"}, {id: "03", name: "Taotao"}, {id: "04", name: "Haha"}]

Method 2: Utilizing the Reduce Method

The reduce method accumulates unique items while checking against a tracking object.

function deduplicateWithReduce(array, keyField) {
  const keyTracker = {};
  
  return array.reduce((accumulator, currentElement) => {
    const identifier = currentElement[keyField];
    if (!keyTracker[identifier]) {
      keyTracker[identifier] = true;
      accumulator.push(currentElement);
    }
    return accumulator;
  }, []);
}

const result = deduplicateWithReduce(dataSet, 'id');
console.log(result);
// Output: [{id: "01", name: "Lele"}, {id: "02", name: "Bobo"}, {id: "03", name: "Taotao"}, {id: "04", name: "Haha"}]

Method 3: Comprehensive Object Comparison

For scenarios requiring deduplication based on entire object content rather than a single property, this method serializes objects for cmoparison.

function eliminateObjectDuplicates(objectArray) {
  const uniqueObjects = [];
  const serializedSet = {};
  
  for (let i = 0; i < objectArray.length; i++) {
    const currentObj = objectArray[i];
    const propertyNames = Object.keys(currentObj).sort();
    let serializedString = '';
    
    for (let j = 0; j < propertyNames.length; j++) {
      const propName = propertyNames[j];
      serializedString += JSON.stringify(propName) + JSON.stringify(currentObj[propName]);
    }
    
    if (!serializedSet.hasOwnProperty(serializedString)) {
      uniqueObjects.push(currentObj);
      serializedSet[serializedString] = true;
    }
  }
  
  return uniqueObjects;
}

const complexData = [
  { id: '01', value: 'Test', tag: 'A' },
  { tag: 'A', value: 'Test', id: '01' },
  { id: '02', value: 'Demo' }
];

const filtered = eliminateObjectDuplicates(complexData);
console.log(filtered);
// Output: [{id: "01", value: "Test", tag: "A"}, {id: "02", value: "Demo"}]