JavaScript console.log() - What's beyond it and why should you know it?

In developing web applications with JavaScript, the console is a fundamental tool for printing messages, debugging errors and evaluating code performance. In this article, we will explore some of the main console methods in JavaScript, grouping them according to their different features and functionalities.

Logging Levels Methods:

• console.log()

The console.log() method is used to print general messages to the console. It is the most commonly used method for printing debugging and program flow tracing information.

console.log("Mensaje de log común");

• console.warn()

The console.warn() method is used to print warning messages to the console. It is useful for highlighting important information that is not an error, but requires attention.

console.warn("Advertencia: Valor incorrecto");

• console.error()

The console.error() method is used to print error messages to the console. It is used to display critical issues that affect the proper functioning of the application.

console.error("Error: Variable indefinida");

Time and Performance Methods:

• console.time() and console.timeEnd()

These methods are used to measure the execution time of a specific section of code. console.time("name") is placed before the code to be measured and console.timeEnd("name") after it.

console.time("miTiempo");// Código a medir

console.timeEnd("miTiempo"); // Corte en el tiempo tomado en ejecutar

Data Visualization and Structuring Methods:

• console.table()

The console.table() method displays data in table form, making it easy to view arrays and objects in a structured and readable format.

const data = [  { id: 1, name: "Alice" },  { id: 2, name: "Bob" },  { id: 3, name: "Charlie" }];

console.table(data);

Stack Trace Methods:

• console.trace()

The console.trace() method displays a complete stack trace, which helps identify the source of an error or a particular execution flow in the code.

function a() {
  b();
}

function b() {
    console.trace();
}

a();

Other Useful Methods:

In addition to the aforementioned methods related to logging levels, time and performance, in JavaScript there are various console methods that can be useful in different contexts. Some of them are:

• console.clear(): Clear the console.

• console.assert(): Print an error message if the specified assertion is false.

• console.group() / console.groupEnd(): Allows you to group messages in the console for a more organized display.

In summary, console methods in JavaScript are powerful tools that make it easy to develop, debug, and evaluate the performance of web applications. Knowing how to use each of these methods will help you better understand your code and its messages in the console.

Let me know in the comments, did you already know these console methods in JavaScript?

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