React Live Regions and Screen Reader Announcements
Announce dynamic updates to assistive technology with polite and assertive live regions, and avoid the mistakes that silence them.
~2 min readread →
Developer interview notes & guides — Page 9
Focused explanations and longer guides, with worked scenarios, common mistakes and interview exercises across every chapter.
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Showing 193–216 of 825 articles
React Context Splitting for Performance
Stop a single context value from re-rendering every consumer by splitting state and dispatch and memoizing the provider value.
~2 min readread →
React lazy Loading and Code Splitting
Split bundles with lazy and Suspense, work with default exports, and place boundaries so a chunk loads only when needed.
~2 min readread →
React Portals and Event Bubbling
Render outside the parent DOM with createPortal while events keep bubbling through the React tree, and manage focus and z-index.
~2 min readread →
React Server Components and the Client Boundary
Split server and client components, mark interactive leaves with use client, and keep props serializable across the boundary.
~2 min readread →
React StrictMode and Double-Invoked Effects
Understand why StrictMode runs effects twice in development, how it surfaces missing cleanup, and why disabling it is the wrong fix.
~2 min readread →
React Form Actions with useActionState
Manage form submission, pending state and server errors with useActionState instead of hand-rolled loading flags.
~2 min readread →
React useOptimistic and Instant Feedback
Show the expected result immediately with useOptimistic, then reconcile with the server and roll back cleanly on failure.
~2 min readread →
React Imperative Handles with useImperativeHandle
Expose a minimal imperative API from a component with forwardRef and useImperativeHandle instead of leaking the DOM node.
~2 min readread →
ServiceNow ACL Scripting and Access
Enforce access with ACLs, use scripted conditions carefully, and test as the actual user to verify.
~2 min readread →
ServiceNow Caching and Invalidation
Understand what the platform caches, when a change takes effect, and how to flush caches consistently across nodes.
~2 min readread →
ServiceNow Dictionary and Field Audit
Define fields in the dictionary, use per-table overrides, and enable audit on the fields that need a history.
~2 min readread →
ServiceNow g_form and Client Script Design
Use the client form API for presentation, keep validation on the server, and avoid heavy client scripts.
~2 min readread →
ServiceNow Notification Controls
Send notifications through events and business rules, gate them with conditions, and prevent the notification storm that floods users.
~2 min readread →
ServiceNow Record Producers
Collect input with a catalog form and create the right record, and know the limits when the target span multiple tables.
~2 min readread →
ServiceNow REST API Design
Expose data through Scripted REST or the Table API, version the contract, and avoid leaking internal tables.
~2 min readread →
ServiceNow Scheduled Jobs
Run recurring server-side work with scheduled jobs, avoid overlap and long runs, and log enough to debug failures.
~2 min readread →
ServiceNow Update Sets and Conflicts
Move configuration with update sets, resolve collisions in order, and avoid the manual edits that break promotion.
~2 min readread →
Spring @Async and Executor Configuration
Run methods asynchronously with @Async, configure a bounded executor, and handle exceptions and the proxy boundary.
~2 min readread →
Spring Boot Caching Abstraction
Cache method results with @Cacheable, choose keys and TTLs, and evict on writes without the self-invocation trap.
~2 min readread →
Spring Declarative HTTP Clients
Define outbound HTTP as an annotated interface with @HttpExchange, create the proxy, and configure timeouts and errors.
~2 min readread →
Spring Boot Problem Details for APIs
Return consistent RFC 7807 error responses, map exceptions centrally, and avoid leaking internals to clients.
~2 min readread →
Spring Boot REST Pagination
Page results with Pageable, always sort stably, and avoid the deep-offset slowdown on large tables.
~2 min readread →
Spring Boot Scheduled Tasks
Run recurring work with @Scheduled, coordinate across instances, and avoid overlap and long-running jobs.
~2 min readread →
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