TypeScript

Generics

TypeScript Handbook Hello World of Generics

example for generic array function

function loggingIdentity<T>(arg: T[]): T[] {
  console.log(arg.length);
  return arg;
}

// explicitly set T if type cannot be interfered (e.g. via argument)
let output = dosomething<string>("myString");

Enums and type aliases

example numeric enum start starts with 1 and automincrements from there

enum AuthLevel {
    Secure = 1,
    Relaxed,
    Public,
}

type alias see see tutorial

export declare type EntityTypePath = 'places' | 'notes' | 'dishes';
function doAlign(path: EntityTypePath):void{
    console.log(path);
}