Exemplos de Uso

Com números

const numbers = new Collection([5, 2, 9, 1])
  .sortBy('value')
  .addFirst(0)
  .addLast(10)
  .removeFirst()
  .removeLast();

console.log(numbers.toArray()); // [5, 2, 9, 1]
console.log(numbers.first());   // 5
console.log(numbers.last());    // 1
console.log(numbers.count());   // 4

Com objetos

const users = new Collection([
  { id: 3, name: 'Carlos', age: 29 },
  { id: 1, name: 'Ana', age: 22 },
  { id: 2, name: 'Bruno', age: 25 },
  { id: 4, name: 'Ana', age: 35 },
]);

const result = users
  .where('name', 'Ana')
  .unique('id')
  .sortBy('age')
  .pluck(['id', 'name'])
  .toArray();

console.log(result);
/*
[
  { id: 1, name: 'Ana' },
  { id: 4, name: 'Ana' }
]
*/

Com métodos encadeados (chaining)

const totalAge = users
  .filter(u => u.age >= 25)
  .map(u => u.age)
  .reduce((sum, age) => sum + age, 0);

console.log(totalAge); // 89

Uso prático

const names = users
  .whereIn('id', [1, 3])
  .pluck(['name'])
  .map(u => u.name.toUpperCase())
  .toArray();

console.log(names); // ['ANA', 'CARLOS']