I have a list of `projects` as followings:

```
projects = [{name: '1',
             agencies: ['USA', 'China']},
            {name: '2',
             agencies: ['Japan', 'Russia']}]

```

I want to get the result `['USA', 'China', 'Japan', 'Russia']`, currently I use the following code, but I would like to know if there is better solution (one line code) using map function:

```
const agencies = [];
projects.forEach((project) =>
        project.agencies.forEach((agency) => {
            agencies.push(agency);
        })
);

```