Merge Objects that have some similarity

Question

Is there any way to join objects that have some similarity ? For example:

var exemplo = [
  {'Title': 'exemple1', 'id': 15},
  {'Title': 'exemple1', 'id': 15},
  {'Title': 'exemple2', 'id': 20}
]

And stay that way:

var exemplo = [
  {'Title': 'exemple1', 'id': 15},
  {'Title': 'exemple2', 'id': 20},
]

Or catch with a loop only one of the objects that are similar?

Answer 1

You can use the function reduce of array to scroll through each item and check if it is already in another array results (which will be populated within the reduce).

const exemplo = [
  {'Title': 'exemple1', 'id': 15},
  {'Title': 'exemple1', 'id': 15},
  {'Title': 'exemple2', 'id': 20},
];

const resultado = exemplo.reduce((acumulador, item) => {
  const filtrados = acumulador.filter((a) => a.Title == item.Title && a.id == item.id).length;
  filtrados > 0 || acumulador.push(item);
  return acumulador;
}, []);

console.log(resultado);

reduce

The method reduce() performs a function reducer (provided by you) for each member of the array, resulting in a single return value.

Example:

const array1 = [1, 2, 3, 4];
const reducer = (accumulator, currentValue) => accumulator + currentValue;

// 1 + 2 + 3 + 4
console.log(array1.reduce(reducer));
// expected output: 10

// 5 + 1 + 2 + 3 + 4
console.log(array1.reduce(reducer, 5));
// expected output: 15

---

filter

The method filter() creates a new array with all the elements that passed the test implemented by the function provided.

function isBigEnough(value) {
  return value >= 10;
}

var filtered = [12, 5, 8, 130, 44].filter(isBigEnough);
// filtered é [12, 130, 44]
console.log(filtered);