Created
July 25, 2019 03:14
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| //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 |
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