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ClassDuo is class registration software for in-person programs like camps, workshops, and community classes. It lets you create schedules, collect payments, manage waitlists, track attendance, send reminders, and handle waivers—all in one place.

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A full list of JavaScript operators with examples

Which is more popular?
Based on our record, JavaScript Operator Lookup seems to be more popular. It has been mentioned 1 time since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | classduo.com | joshwcomeau.com |
| Pricing | — | |
| Company | Startup from the United States · 1 - 9 employees · 2024 | — |
| Listed in |
In their own words, as submitted to SaaSHub.


ClassDuo is a modern class registration platform designed for organizations that offer in-person classes, workshops, camps, or community programs. It streamlines the entire registration process, making it easy for staff to create class schedules, publish registration pages, collect payments, and...
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Share your experience with using ClassDuo and JavaScript Operator Lookup. For example, how are they different and which one is better?
Recommendations tracked on public social media and blogs since March 2021.


Tracking ClassDuo since Jul 2025.
If you replace your || with ?? You should get the behaviour you are after. This is a good reference for what the operators do in js: https://joshwcomeau.com/operator-lookup. Source: about 5 years ago
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