Typescript-MedJS.ts

//Basic Types: boolean, string, arrays, number,
//             null, undefined, void, object, never, Symbol

var grettings: string  = "Hola esto es un string";
grettings = {attendets: "gracias por venir"}; //error

//capturar comportamientos inesperados
const sumWeird = {attendets: "Hola"} + ["como estan"]; //error

//Type inference
let  gretting = {attendets: "gracias por venir"};
gretting = "Hola esto es un string"; //error

//Type assertion, Type Literal, Union types
interface communities{
    medellin: string[]
    cali: string[]
}
const communities : communities = {medellin: ["medjs", "pioneras"], cali: ["calijs", "pioneras"]}
    
Object.keys(communities).forEach((value)=>{
    const city: "medellin" | "cali" = value as keyof communities ;
    console.log(city)
  })
  

//Spaces declaration
    //Variable declaration 
        class CatClass{
            isCute(){ return 1}
            isDangerous(){return 2}
        }

        enum CatEnum {
            cute = 1,
            dangerous= 2
        }
        const a =  CatEnum;
    
    //Type declaration
        type CatType = {}
        interface catInterface{}
        const b =  catInterface; /error