A: All code for patterns and utilities here is provided under the MIT license (unless explicitly specified). This means you are free to use it in your projects, even commercially.
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A: Because I don't want to maintain a canonical implementation of these patterns. These implementations are provided as a reference. You should read them, import them into your own project manually, change the namespace, and adapt them to your own needs.
A: Sometimes, implementations need utility methods that I reuse a lot. I put those in database. Each pattern page should tell you which utilities are needed. If not, ping me on Twitter (@lazlobon) and I'll fix it.