Understanding Why console.log Returns [object Set] Instead of a Proper Set in JavaScript

---

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: Function returns [object Set] instead of an actual Set

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---

You may be running a function that utilizes a Set, updating it in a recursive manner, only to be thrown off when you log the Set from one function and see a string like this:

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

In contrast, when you console log the Set directly, you get an output similar to:

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

This leads us to wonder: why is there a difference in response based on where and how we are logging our Set?

Direct Logging vs. String Interpolation

Direct Logging:

Template Literals/Interpolation:

Array Conversion and String Output

Solutions: How to Properly Log Set Contents

To clearly see the contents of your Set object, consider the following options:

Use Direct Logging:

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

Convert to an Array Before Logging:
If you still wish to utilize template literals for logging, convert the Set to an array first:

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

Utilize the Spread Operator:
Another elegant way to display Set elements is with the spread operator:

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

Conclusion

Don't let the console's feedback confuse you; use direct logging or transformation methods to visualize your data more clearly. Keep these tips in mind, and you'll be efficiently debugging your JavaScript code in no time!