Angular 6如何从对象数组中获取基于相同值的特定列的计数

const data = [
  { name: 'Alice', age: 25, city: 'New York' },
  { name: 'Bob', age: 30, city: 'London' },
  { name: 'Alice', age: 35, city: 'Paris' },
  { name: 'Charlie', age: 40, city: 'New York' },
  { name: 'Alice', age: 30, city: 'London' }
];

const countByCity = data.reduce((acc, obj) => {
  const key = obj.city;
  if (!acc[key]) {
    acc[key] = 0;
  }
  acc[key]++;
  return acc;
}, {});

{
  "New York": 2,
  "London": 2,
  "Paris": 1
}

const city = 'New York';
const count = countByCity[city] || 0;
console.log(`The count of ${city} is ${count}`);