query.js

function order(sortKey) {
  return (items) => {
    return [...items].sort((a, b) => a[sortKey] < b[sortKey] ? 1 : -1);
  };
}

function where(filter) {
  const [filterKey] = Object.keys(filter);
  return (items) =>
    items.filter((item) => item[filterKey] === filter[filterKey]);
}

function query(...transformers) {
  return (items) =>
    transformers.reduce((acc, transformer) => transformer(acc), items);
}

test("query", function () {
  const data = [
    { id: 1, name: "John", surname: "Doe", age: 34 },
    { id: 2, name: "John", surname: "Doe", age: 33 },
    { id: 3, name: "John", surname: "Doe", age: 35 },
    { id: 4, name: "Mike", surname: "Doe", age: 35 }
  ];

  const ids = query(
    where({ name: "John" }),
    where({ surname: "Doe" }),
    order("age")
  )(data).map((u) => u.id);

  expect(ids).toStrictEqual([3, 1, 2]);
});