It must be called during the component's initialisation (but doesn't need to live inside the component; it can be called from an external module).

Because Svelte is a compiler, we're not bound to the peculiarities of JavaScript: we can design a component authoring experience, rather than having to fit it around the semantics of the language.

In a nutshell, the King's Keys deck started as an experiment to see what card games would be like if you rebuilt playing cards from the ground up. Instead of using ranks and suits, each card has a number (from one to four), one of four items, and one of four colors. The result is what I call a 4x4x4 deck where 64 playing cards each have a unique combination of these three parts.