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Redescubriendo el console.log 2/2 - CodigoLinea
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Redescubriendo el console.log 2/2


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En el artículo anterior ya tratamos sobre los principales métodos del objeto console, Aquí veremos el método log y algunos pequeños consejos para aprovechar mejor su funcionalidad.

Agrupar variables

Cuando los valores de las variables no son muy grandes puedes agruparlos para tener una mejor visualización

const a = { v: 1 };
const b = { v: 2 };
const c = { v: 3 };

console.log("--Bad idea---");
console.log("a", a);
console.log("b", b);
console.log("c", c);

console.log("--Good idea---");
console.log({ a, b, c });

También puedes usarlo para mostrar una sola variable;

const dayOfWeek = "Monday";

console.log("--Bad idea---");
console.log("dayOfWeek", dayOfWeek); 

console.log("\n--Good idea---");
console.log({dayOfWeek}); 

Agregarle color

Podemos personalizar los colores de nuestros mensajes, no se si sea muy útil, pero es divertido.

Ejemplo 1

Tomando el código del ejemplo anterior

const dayOfWeek = "Monday";

console.log("%c%s","color: red;font-weight: bold;","Bad idea!");
console.log("dayOfWeek", dayOfWeek); 

console.log("%c%s","color: green;font-weight: bold;","\nGood idea!");
console.log({dayOfWeek}); 

Ejemplo 2

Personalizando los mensajes de succes, error, warning e info

function customLog(message, color='black') {
     let logType = 'log';
     switch (color) {
         case 'success':  
              color = 'Green';
              break
         case 'info':     
              color = 'Blue';
              logType = 'info';
              break;
         case 'error':   
              color = 'Red'; 
              logType = 'error';
              break;
         case 'warning':  
              color = 'Orange';
              logType = 'warn';
              break;
         default: 
              color = color
     }

     console[logType](`%c${message}`, `color:${color}`);
}


customLog('Success!', 'success')
customLog('Error!', 'error')
customLog('Warning!', 'warning')
customLog('Info...', 'info')

Ejemplo 3

Escribir mensaje con múltiples colores

const customLog = (message, color = "black") => {
    const colors = {
        green: "green",
        blue: "blue",
        red: "red",
        orange: "orange",
        black: "black",
        lime: "lime"
    };

    console.log(`%c${message}`, `color:${colors[color]}`);
};

customLog("Hello!!");
customLog("Hi green", "green");
customLog("Hi blue", "blue");
customLog("Hi red", "red");
customLog("Hi orange", "orange");
customLog("Hi lime", "lime");

Ejemplo 4

Si estas muy aburrido y quieres mostrar tus habilidades de hacker y mandar mensajes en el console.log puedes usar este truco, pero ten en consideración que solo funciona en google chrome.

console.log("%cJavaScript is amazing!",
    `\
    font-size: 3em; \
    background: red url("https://i.imgur.com/Uyw52SY.gif") \
    no-repeat center center;\
    background-size: 110% 110%; \
    font-weight: bold; \
    color: white; \
    text-shadow: 0 0 1em black, 0 0 1em black, 0 0 1em black, 0 0 1em black, 0 0 1em black; \
    padding: 1% 2% 25%; \
`)

No usar en producción

Evite usar el objeto console en producción, a parte de que puedes exponer información no deseada puede ralentizar tu aplicación.

¿Conoces algun truco o tip sobre el console.log? colócalo en los comentarios

benjamin
Me llamo Benjamín Gonzales B, soy desarrollador de software con más de 15 años de experiencia, socio funduador de la empresa GNBIT. Me apasiona todo lo relacionado a las nuevas tecnologías, me gusta investigar , leer y aprender cada día algo nuevo. Desarrollo en PHP7+, JAVA, C#, JavaScript, entre otros y actualmente  estoy experimentando con lenguajes funcionales como: Erlang, Clojure y Scala 

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