CodeParkBuild a small package manager as a PackageInstaller class.
new PackageInstaller(registry) takes an object. It maps each package name to the list of packages it directly needs, for example { app: ["web", "db"], web: ["http"], db: [], http: [] }. Nothing is installed at the start.
Input: pm = new PackageInstaller({ app: ["web", "db"], web: ["http"], db: [], http: [] })
pm.install("app")
Output: ["http", "web", "db", "app"]
Input: pm.install("web")
Output: []already installed
It comes in 3 parts, each building on the last: Install, Uninstall, Install order and loops.