//Empty map
let d1 = new Map<string, number>()

//init map with some data
let numbers1 = new Map([
    [ 1, "one" ],
    [ 2, "two" ]
])
numbers1.set(3, "three")

//Using an indexed object
let numbers2: { [key: number]: string } = {
    [1]: "one", [2]: "two"
}

console.log("d1 is", d1)
console.log("numbers1 is", numbers1)
console.log("numbers2 is", numbers2)