Problem Statement
How do you implement parallel routes with @folder slots and what are their use cases?
Explanation
Implement parallel routes by creating @slot folders like @team and @analytics alongside a layout.js that receives them as props, allowing independent rendering of multiple sections simultaneously with isolated loading and error states. The layout renders each slot where needed like div slot.team div and div slot.analytics div, and each slot can have its own page.js, loading.js, and error.js. Use parallel routes for dashboards showing multiple data sources that load independently, implementing modals by intercepting routes into a @modal slot while keeping the background page in the children slot, creating split views like email clients with @list and @detail, or showing contextual panels that update based on the main content. Parallel routes support conditional rendering with default.js fallbacks when a slot doesn't match the current route, enabling complex UI patterns that were difficult with traditional routing.
Practice Sets
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