I have an array of objects. Want to make one universal object, with all possible keys and values like in resultObj.

  let arr = [
          { "11": [ 19,20 ], "12": [ 21, 22, 24], "13": [ 25, 27 ]}
          { "11": [ 19,30 ], "12": [ 22, 23], "13": [ 25, 26, 27 ], "14": [ 28, 29 ]}
          { "11": [ 19,20,30 ], "12": [ 21, 23], "13": [ 26 ], "15": [ 31, 32, 33 ]}
    ]

let resultObj = {"11": [ 19,20,30 ], "12": [ 21, 22, 23, 24], "13": [ 25, 26, 27 ], "14": [ 28, 29 ], "15": [ 31, 32, 33 ]}

CodePudding user response：

You can use this code :

let arr = [
    { "11": [ 19,20 ], "12": [ 21, 22, 24], "13": [ 25, 27 ]},
    { "11": [ 19,30 ], "12": [ 22, 23], "13": [ 25, 26, 27 ], "14": [ 28, 29 ]},
    { "11": [ 19,20,30 ], "12": [ 21, 23], "13": [ 26 ], "15": [ 31, 32, 33 ]},
]

let keys = [...new Set(arr.flatMap(obj => Object.keys(obj)))];

let result = Object.fromEntries(
    keys.map(k => [k, [...new Set(arr.map(obj => obj[k] ).filter(obj => obj).flat())]])
);

console.log(result);

CodePudding user response：

1. loop over all items in the array
2. loop over each value in the key array
3. set them to their key in the reduced object, avoid duplicates by using a Set

const arr = [
  { 11: [19, 20], 12: [21, 22, 24], 13: [25, 27] },
  { 11: [19, 30], 12: [22, 23], 13: [25, 26, 27], 14: [28, 29] },
  { 11: [19, 20, 30], 12: [21, 23], 13: [26], 15: [31, 32, 33] },
];

const result = arr.reduce((accumulator, currentValue) => {
  Object.entries(currentValue).forEach(([key, value]) => {
    accumulator[key] = [...new Set([...(accumulator[key] || []), ...value])];
  });
  return accumulator;
}, {});

// {
//   '11': [19, 20, 30],
//   '12': [21, 22, 24, 23],
//   '13': [25, 27, 26],
//   '14': [28, 29],
//   '15': [31, 32, 33],
// };