Strategy

Swappable algorithms — spin modes, reel behaviors.

Where: pixi-reels' SpinningMode interface (Standard, Cascade, Immediate). Registered via ReelSetBuilder.

The rule: pick an algorithm at construction, not at call time. Classic cascade games choose CascadeMode; classic 5×3 games use StandardMode; demos use ImmediateMode.

Don't: branch on mode === 'cascade' in 50 places. One strategy, one implementation, one registration.