Whether you’re just starting to learn JavaScript or are an experienced engineer, debugging is an essential part of development. Here, we’ll introduce basic methods to streamline the debugging process. In this article, we’ll delve into debugging techniques using alert and console.log.
The Importance of Debugging in JavaScript
In programming, debugging is the process of identifying and fixing errors in code. During the process of learning JavaScript, debugging helps you understand what might be wrong when your code doesn’t behave as expected. alert and console.log are two fundamental tools that support this process.
Debugging with alert
alert is a simple method to display a small dialog box in the browser, notifying the user with a message. This is useful for confirming that specific parts of code have been executed.
alert("If you see this message, the code has been executed correctly up to this point.");
Although intuitive and easy, this method is not suitable when you don’t want to show debugging information to the user or when dealing with complex data.
Refined Debugging with console.log
console.log is a method to output messages to the browser’s developer tools console. By using it, you can monitor variable values and program states in real time.
console.log("The value of this variable is: ", variable);
console.log can handle complex objects and arrays, making it an extremely powerful tool in the debugging process.
JavaScript Code to Display alert Text and Output Text in console.log
* The variable str1 holds the text to be displayed in the alert, while str2 holds the text to be output to the console log.
<script type="text/javascript">
str1 = "Alert text displayed!";
str2 = "Console log output text.";
alert(str1);
console.log(str2);
</script>
Demo Page to Display alert Text and Output Text in console.log
It’s important not just to learn the theory, but to actually practice. The demo page below shows how alert and console.log work in a browser.
Demo to Display alert Text and Output Text in console.log
Conclusion
Debugging in JavaScript is an essential step in the development process. alert and console.log are simple yet powerful tools for confirming that your program behaves as expected. If even beginners can master these tools, the world of JavaScript becomes much more approachable. I hope this article serves as a helpful step in your JavaScript journey.
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