Is there a way to filter a array of object and make another array of object with matching properties-CodePudding

say I have an array of objects below

    const testObjects = [{ name: 'object1', detail1: 'detail', number: '25', detail2: ''},{ name: 'object2', detail1: 'detail', number: '5', detail2: '' },{ name: 'object3', detail1: 'detail', number: '19', detail2: '' },{ name: 'object4', detail1: 'detail', number: '38', detail2: '' },{ name: 'object1', detail1: 'detail', number: '12', detail2: 'some other detail'},{ name: 'object3', detail1: '', number: '71', detail2: 'detail' },];

I need to sort it a way that if the same name is matched in that array then it will return a new array of objects having both values. Like below

const finalObjects=[{ name: 'object1', detail1: 'detail', number: ['25','12'], detail2: 'some other detail' },
{ name: 'object2', detail1: 'detail', number: '5', detail2: '' },
{ name: 'object3', detail1: 'detail', number: ['19','71'], detail2: 'detail' },
{ name: 'object4', detail1: 'detail', number: '38', detail2: '' },]

CodePudding user response：

You can easily resolve this using Set

const seen = new Set();
const arr = [
  { id: 1, name: "test1" },
  { id: 2, name: "test2" },
  { id: 2, name: "test3" },
  { id: 3, name: "test4" },
  { id: 4, name: "test5" },
  { id: 5, name: "test6" },
  { id: 5, name: "test7" },
  { id: 6, name: "test8" }
];

const filteredArr = arr.filter(el => {
  const duplicate = seen.has(el.id);
  seen.add(el.id);
  return !duplicate;
});

CodePudding user response：

you need this right?:

let seen = new Map();
const arr = [
  { id: 1, name: "test1" },
  { id: 2, name: "test2" },
  { id: 1, name: "test1", attribute: "Something" },
  { id: 3, name: "test4" },
  { id: 4, name: "test5" },
  { id: 5, name: "test6" },
  { id: 5, name: "test7" },
  { id: 6, name: "test8" }
];

const filteredArr = [];

arr.forEach(element => {
  const duplicate = seen.get(element.name);
  if (duplicate) {
    const currentKeys = Object.keys(element);
    currentKeys.forEach(key => {
      if (duplicate[key] === undefined) {
        duplicate[key] = element[key]
      }
    })
    seen.set(element.name, duplicate)
  } else {
    seen.set(element.name, element)
  }
})

seen.forEach((value, name) => filteredArr.push(value));

console.log(filteredArr)