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// types
let n : Number = 1;

// arrays
let names : String[] = ["John", "Roman"];

// enums
enum Sport {Soccer, Tennis}
let mySport : Sport.Soccer;

// function
function getName() : String {
    return "Roma";
}

// void function
function voidFunction() : void {
    console.log("Hello!");
}

// interface
interface Person {
    name: String;
    //optional field
    age?: Number;
}
let iam : Person = {name : "Roman", age : 30};