var names = {}   // empty map
names["foo"] = "bar"
names[3] = 4

// initialized map
var names2 = {"foo": bar, 3:4}

// lookup map
var name = names["foo"]
if (typeof(name) == "none") {
    println ("not found")
} else {
    println (name)
}

// remove from map
delete names["foo"]