class in TypeScript

Classes are declared by using the class keyword followed by an identifier.
* TypeScript class has no class-level access modifier. 
* The name of the class follows the class keyword. The name of the class must be a valid identifier. 
* The remainder is the class body, where the class members are defined, including fields, and methods.
```
// [class] - [identifier]
class Program {
    // Fields and methods go here...
    v: number = 10;
}

var p = new Program();
console.log(p.v)
```
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