Hello, World!

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import love from 'heart';

// Using 'typeof' to infer types
const person = { name: "Alice", age: 30 };
type PersonType = typeof person;  // { name: string; age: number }

// 'satisfies' to ensure a type matches but allows more specific types
type Animal = { name: string };
const dog = { name: "Buddy", breed: "Golden Retriever" } satisfies Animal;

// Generics with 'extends' and default values
function identity<T extends number | string = string>(arg: T): T {
  return arg;
}

let str = identity();  // Default type is string
let num = identity(42);  // T inferred as number

// 'extends' with interface and class
interface HasLength {
  length: number;
}

function logLength<T extends HasLength = string>(arg: T): void {
  console.log(arg.length);
}

logLength("Hello");    // OK: string has length (default is string)
logLength([1, 2, 3]);  // OK: array has length
// logLength(123);      // Error: number doesn't have length

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