example of javascript array flat map alternative for typescript

array-flat-map-alternative.js

// example of array flat map alternative

const data = [
    {
        city: [
            {
                country: "Bhutan"
            },
            {
                country: "Bhutan"
            },
            {
                country: "Bhutan"
            }
        ]
    }
];

console.log(
    data
        .map(({ city }) => city.map(({ country }) => country))
        .reduce((x, y) => x.concat(y), []) // [...x, ...y]
);