js数组中的对象去重

去重数组：

[     { 
                "itemId": 1,         "itemName": "整体",         "libraryId": 3,         "objectName": "车行道",         "categoryName": "道路感知质量评价",         "categoryId": 1,         "objectId": 1     },     { 
                "itemId": 2,         "itemName": "纸塑、果皮等 ",         "libraryId": 3,         "objectName": "车行道",         "categoryName": "密度质量检测",         "categoryId": 2,         "objectId": 3     },     { 
                "itemId": 3,         "itemName": "纸塑、果皮等",         "libraryId": 3,         "objectName": "人行道",         "categoryName": "密度质量检测",         "categoryId": 2,         "objectId": 4     },     { 
                "itemId": 4,         "itemName": "整体",         "libraryId": 3,         "objectName": "人行道",         "categoryName": "道路感知质量评价",         "categoryId": 1,         "objectId": 2     },     { 
                "itemId": 10,        "itemName": "路面本色",
        "libraryId": 3,
        "objectName": "车行道",
        "categoryName": "道路感观质量评价",
        "categoryId": 1,
        "objectId": 1
    },
    { 
       
        "itemId": 11,
        "itemName": "路面本色",
        "libraryId": 3,
        "objectName": "人行道",
        "categoryName": "道路感观质量评价",
        "categoryId": 1,
        "objectId": 2
    }
]

比如我们要去重objectId或者categoryId,只需要传入数组和id名称即可：

/**
 * 传入数组，和去重数组中的对象属性名
 * @param arr
 * @param id 字符串类型，对象属性名
 * @returns { 
       *}
 */
export function removeDuplicateObj(arr,id) { 
       
  let obj = { 
       };
  arr = arr.reduce((newArr, next) => { obj[next[id]] ? "" : (obj[next[id]] = true && newArr.push(next));
    return newArr;
  }, []);
  return arr;
}

去重后：

[
    { 
       
        "itemId": 1,
        "itemName": "整体",
        "libraryId": 3,
        "objectName": "车行道",
        "categoryName": "道路感观质量评价",
        "categoryId": 1,
        "objectId": 1
    },
    { 
       
        "itemId": 4,
        "itemName": "整体",
        "libraryId": 3,
        "objectName": "人行道",
        "categoryName": "道路感观质量评价",
        "categoryId": 1,
        "objectId": 2
    }
]