Interview Questions
The Context API allows passing data through the component tree without prop drilling. Uses setContext and getContext functions. Context is available to component and its descendants. Useful for sharing data/functionality.
Context is set using setContext function from svelte. Example: setContext('key', value). Must be called during component initialization. Value can be any type including functions.
Context is retrieved using getContext function. Example: const value = getContext('key'). Must use same key as setContext. Available in component and child components.
Context keys must be unique within component tree. Often use symbols for guaranteed uniqueness. Example: const key = Symbol(). Prevents key collisions between different contexts.
Context exists throughout component lifecycle. Created during initialization. Available until component destruction. Cannot be changed after initialization. New values require component reinitialization.
Common uses include theme data, localization, authentication state, shared functionality. Useful for cross-cutting concerns. Avoids prop drilling. Supports component composition.
Functions can be shared through context. Example: setContext('api', { method: () => {} }). Allows child components to access shared methods. Supports dependency injection pattern.
Context is scoped to component and descendants. Not available to parent or sibling components. Multiple instances create separate contexts. Follows component hierarchy.
getContext returns undefined if context not found. Should handle undefined case. Can provide default values. Consider error handling for required context.
Context is static, set during initialization. Stores are reactive, can change over time. Context good for static values/dependencies. Stores better for changing state.
Context patterns include provider components, dependency injection, service locator. Handle context composition. Support context inheritance. Implement context strategies.
Context updates require component reinitialization. Can combine with stores for reactive updates. Handle update propagation. Manage update lifecycle.
Context validation ensures valid context values. Handle type checking. Support validation rules. Implement error handling. Manage validation state.
Context dependencies manage relationships between contexts. Handle dependency order. Support circular dependencies. Implement dependency resolution.
Context composition combines multiple contexts. Handle context merging. Support context inheritance. Implement composition patterns.
Context initialization sets up initial context state. Handle async initialization. Support initialization order. Implement initialization strategies.
Context middleware processes context operations. Handle context transformation. Support middleware chain. Implement middleware patterns.
Context error handling manages error states. Handle missing context. Support error recovery. Implement error boundaries.
Context optimization improves performance. Handle context caching. Support selective updates. Implement optimization strategies.
Context cleanup manages resource disposal. Handle cleanup order. Support cleanup hooks. Implement cleanup strategies.
Advanced patterns include context injection, service location, dependency trees. Handle complex dependencies. Support pattern composition.
Context testing verifies context behavior. Handle test isolation. Support integration testing. Implement test utilities.
Context monitoring tracks context usage. Handle performance tracking. Support debugging tools. Implement monitoring strategies.
Context documentation describes context usage. Generate documentation automatically. Support example usage. Manage documentation updates.
Context versioning handles API changes. Implement version migration. Support backwards compatibility. Manage version state.
Context security prevents unauthorized access. Handle access control. Support security policies. Implement security measures.
Context debugging tracks context issues. Handle debugging tools. Support state inspection. Implement debug logging.
Performance monitoring tracks context efficiency. Handle metrics collection. Support performance analysis. Implement optimization strategies.
Dependency injection manages component dependencies. Handle injection patterns. Support service location. Implement injection strategies.
Type safety ensures correct context usage. Handle TypeScript integration. Support type checking. Implement type definitions.