Y Combinator Co-founder Matching might be a bit more popular than JavaScript.com. We know about 1 link to it since March 2021 and only 1 link to JavaScript.com. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
The best resource I know of is Javascript.com for learning Javascript for the first time. It's made by Pluralsight which is a site that contains courses. - Source: dev.to / almost 3 years ago
One idea I just remembered is to find a business co-founder that already knows a market well and sees an opportunity. Startup School's co-founder matching service is quite good. Source: over 3 years ago
JavaScript Operator Lookup - A full list of JavaScript operators with examples
CoFoundersLab - Meet 250,000+ entrepreneurs online
The State of JavaScript 2018 - Discover the latest trends in the JavaScript ecosystem
Founders Nation - Find or become a startup cofounder
Learn JavaScript - Learn JavaScript with guided tests and flashcards
Findnlink - Find people to work with on your ideas.