reducedFilter

Filter an array of objects based on a condition while also filtering out unspecified keys.

Use Array.prototype.filter() to filter the array based on the predicate fn so that it returns the objects for which the condition returned a truthy value. On the filtered array, use Array.prototype.map() to return the new object using Array.prototype.reduce() to filter out the keys which were not supplied as the keys argument.

const reducedFilter = (data, keys, fn) =>
  data.filter(fn).map((el) =>
    keys.reduce((acc, key) => {
      acc[key] = el[key];
      return acc;
    }, {})
  );

const data = [
  {
    id: 1,
    name: "john",
    age: 24,
  },
  {
    id: 2,
    name: "mike",
    age: 50,
  },
];

reducedFilter(data, ["id", "name"], (item) => item.age > 24); // [{ id: 2, name: 'mike'}]