Map: iterable key-value data

map<T> stores values under string keys. It provides keys for iteration.

func main() {
    var rewards: map<int> = {entries: [
        {key: "daily", value: 10},
        {key: "weekly", value: 50}
    ]} as map<int>

    rewards["bonus"] = 5
    print(rewards["daily"])

    for (key: rewards.keys) {
        print(key)
        print(rewards[key])
    }
}

Storage layout

A Map uses an entries list. Each entry contains key and value. Create an empty Map with:

func main() {
    var rewards: map<int> = {entries: []} as map<int>
    rewards["daily"] = 10
    print(rewards.size())
}

as map<T> interprets data with this layout. Supply entries directly to match the current implementation.

Common methods include containsKey(key), remove(key), merge(other), size(), isEmpty(), and clear().

Use a dictionary for direct key access. Use Map when you need to list all keys.