what is wtfjs fr?

wtfjs is a collection of surprising, counterintuitive, and often amusing JavaScript behaviors. It gathers examples where the language does things you would not expect, like an empty array being "equal" to not-an-array, or adding two arrays together producing a single string of comma-separated numbers. Each example comes with an explanation of why the language behaves that way. JavaScript has a reputation for being a forgiving language to write, but that flexibility can lead to surprising results. The project breaks down the confusing outputs step by step, translating them through the language's internal rules. Many of the quirks come from how JavaScript automatically converts types, turning arrays into numbers, strings into booleans, or objects into text, in ways that are technically correct according to the specification but feel completely wrong to a human reader. The explanations trace each result back to the official rules that govern the language. This is useful for beginners who want to understand JavaScript more deeply, or experienced developers who want a reference for the kinds of bugs and misunderstandings that can arise from the language's edge cases. If you have ever written a line of code and gotten a result that made no sense, this collection likely covers that exact scenario. It turns those head-scratching moments into learning opportunities by showing the logic behind the weirdness. You can read it directly on GitHub or install it as a command-line manual using npm, which lets you browse the examples in your terminal. The project is essentially a handbook of JavaScript's strangest corners, meant to be both educational and entertaining.