Скачать или смотреть How to Create a console.log Statement That Displays a Function’s Code Instead of Executing It

Learn how to easily `display the contents of a function` using console.log in JavaScript. Follow our step-by-step guide for a clear understanding!
---
This video is based on the question https://stackoverflow.com/q/64671742/ asked by the user 'gursh' ( https://stackoverflow.com/u/14411879/ ) and on the answer https://stackoverflow.com/a/64671754/ provided by the user 'Snow' ( https://stackoverflow.com/u/11081214/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Functions - Display vs. Execution console.log

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Displaying Function Contents with console.log in JavaScript

When you’re coding in JavaScript, a common challenge you might face is wanting to display the contents of a function rather than executing it. Whether you want to share code snippets, debug, or just inspect your function, knowing how to effectively use console.log is key. In this guide, we'll break down this problem and provide a clear solution for displaying the contents of a function using console.log.

The Challenge Explained

In JavaScript, when you write a function and call it using the parentheses (e.g., add20(5)), the function gets executed, and you see the output of that execution. However, in scenarios where you simply want to display the function definition itself—its code—you need to approach this a little differently.

For instance, consider the following function:

[[See Video to Reveal this Text or Code Snippet]]

If you want to display its contents, the goal is to see function add20(num) { return num + 20; } in the console, not the result of executing that function.

The Solution

To achieve this, you can directly log the function without calling it. Thankfully, JavaScript allows you to do this quite easily. Here’s the code you need:

[[See Video to Reveal this Text or Code Snippet]]

Step-by-Step Breakdown

Define the Function: First, you create your function as usual. Give it a name (e.g., add20) and define its logic.

Use console.log: Rather than calling the function by adding parentheses (which would execute it), you use the function name alone within the console.log statement.

Run the Code: When you run this snippet, the output in the console will display the function definition itself, allowing you to see the entire content of the function.

Key Points to Remember

Direct Reference: Just using the function name in the console.log statement provides a reference to the function without invoking it.

No Parentheses: Avoid using parentheses when accessing the function within console.log, otherwise, it will execute the function instead of displaying it.

Inspecting Function Definitions: This method is helpful for debugging or understanding function bodies in larger codebases.

Conclusion

Navigating JavaScript functions and understanding how to display their contents can significantly enhance your coding skills. By using a straightforward console.log statement, you can easily inspect the function definitions without executing them, making debugging and code sharing much simpler. Remember, practice makes perfect! Try using this technique in your own projects to become more comfortable with JavaScript functions.