Make it yours.Save notes, decks & boards to your own library.

openstem

Explore

Spaces

My Library

All fields Software Mathematics Physics Chemistry Biology Engineering Astronomy Environmental Other Software Software groups

Explore STEM Content

Search the community's STEM library — free to study, yours to make your own.

Software

Programming, algorithms and systems on openstem — flashcards, notes, quizzes, sketches and flowcharts shared by the community. Study free, or clone anything into your library.

Content Groups1

Loading…

loading…

About Privacy Terms of Service© openstem

We use privacy-friendly product analytics (no session recording, PII masked) to improve OpenStem. Load analytics? Privacy Policy

openstem

Explore

Groups Favorites

Collections Notes Flashcards Quizzes Sketches Flowcharts Plots Molecules

Make it yours.Save notes, decks & boards to your own library.

Get started Sign in

Explore Groups Favorites

Software: explore STEM content (page 18 of 25) · openstem

All fields Software Mathematics Physics Chemistry Biology Engineering Astronomy Environmental Other Software Software groups

Explore STEM Content

Search the community's STEM library — free to study, yours to make your own.

Software

Programming, algorithms and systems on openstem — flashcards, notes, quizzes, sketches and flowcharts shared by the community. Study free, or clone anything into your library.

Content Groups1

Loading…

Flashcards10 cards

What is each of the three trees responsible for, and how do they relate?1 / 10

The Widget tree is an immutable, cheap-to-rebuild configuration. The Element tree is the long-lived, mutable instantiation that holds state, BuildContext, and parent/child links. The RenderObject tree does layout, painting, and hit testing. Each Element points to one widget (its current config) and, for RenderObjectElements, to one RenderObject.

Software

Rendering Pipeline: Widget / Element / RenderObject

@openstem

Rendering Pipeline: Widget / Element / RenderObject

Flashcards4 cards

State the FLP impossibility result.1 / 4

Fischer, Lynch, and Paterson (1985): in a fully asynchronous message-passing system, there is no deterministic protocol that solves consensus even if at most one process may crash-fail. The key conditions: asynchrony (no bound on message delay or computation speed), determinism, and tolerance of just one crash. This rules out wait-free consensus in the pure async model.

Software

Software · L5 · Distributed Systems Theory

@openstem

Software · L5 · Distributed Systems Theory

Flashcards10 cards

What is CORS and why does it exist?1 / 10

Cross-Origin Resource Sharing controls which origins (scheme+host+port) may access a resource via browser fetch/XHR. It exists to relax the Same-Origin Policy safely — the server sends Access-Control-Allow-Origin headers to opt-in specific origins.

Software

Web Protocols

@openstem

Web Protocols

Flowchart7 objects

Software

Software · L2 · Data Structures & Algos: Graph Traversal · flowchart

@openstem

Software · L2 · Data Structures & Algos: Graph Traversal · flowchart

Flashcards10 cards

What is a Terraform module?1 / 10

A module is a reusable container of .tf files in a directory. The root module calls child modules via a module block, passing inputs and reading outputs.

Software

Modules & Variables

@openstem

Modules & Variables

Flashcards10 cards

What is Infrastructure as Code (IaC)?1 / 10

Managing and provisioning infrastructure through declarative configuration files instead of manual console clicks. Benefits: version control, repeatability, code review, and automated provisioning. Terraform is a leading provider-agnostic IaC tool.

Software

IaC Fundamentals

@openstem

IaC Fundamentals

Collection2 items

01Message Queues & Streaming

02Scalability & Reliability

Software

Software · L3 · System Design

@openstem

Software · L3 · System Design

Collection4 items

01Modules & Providers

02Controllers, Pipes & Guards

03Software · L2 · NestJS: Custom Provider Resolution

+1 more

Software

Software · L2 · NestJS

@openstem

Software · L2 · NestJS

Quiz5 questions

When does a useEffect's cleanup function run?

AOnly when the component unmountsBBefore the effect re-runs (deps changed) and on unmountCImmediately before the render phase startsDIt never runs automatically

Software

Software · L2 · React: Hooks & Effects Check

@openstem

Software · L2 · React: Hooks & Effects Check

Flashcards10 cards

What three parts make up an IAM policy binding in GCP?1 / 10

A binding ties a role (a set of permissions) to one or more members (principals) on a resource; the policy is the collection of bindings.

Software

IAM & Security

@openstem

IAM & Security

Note~737 words · 4 min

Data Partitioning & Replication at Scale A single machine eventually runs out of disk, memory, or write throughput. Partitioning (sharding) splits data across many machines so the system scales horizontally; replication copies data across m

Software

Software · L4 · Data Partitioning & Replication at Scale

@openstem

Software · L4 · Data Partitioning & Replication at Scale

Flashcards10 cards

What is Inversion of Control (IoC) in Spring?1 / 10

Instead of objects creating their own dependencies, the Spring IoC container creates and injects them. This decouples components, centralizes wiring, and makes testing easy (inject mocks). Dependency Injection is the mechanism that implements IoC.

Software

Core & Dependency Injection

@openstem

Core & Dependency Injection

Flashcards8 cards

What is the difference between select/poll and epoll, and why does it matter at scale?1 / 8

select() and poll() require the kernel to scan the entire set of file descriptors on each call — O(n) per wakeup. epoll uses an event-driven model: the kernel only delivers events for ready FDs, so the application scales to hundreds of thousands of connections with O(1) per event.

Software

Advanced OS Concepts

@openstem

Advanced OS Concepts

Collection4 items

01Software · L5 · Computability Theory

02Software · L5 · Computability Theory

03Software · L5 · Decidability Hierarchy

+1 more

Software

Software · L5 · Computability Theory

@openstem

Software · L5 · Computability Theory

Collection4 items

01Software · L5 · Hoare Logic & Program Verification

02Software · L5 · Hoare Logic & Program Verification

03Software · L5 · Proving a While Loop Correct

+1 more

Software

Software · L5 · Hoare Logic & Program Verification

@openstem

Software · L5 · Hoare Logic & Program Verification

Flowchart9 objects

Software

Software · L2 · Flutter: Networking & Data · flowchart

@openstem

Software · L2 · Flutter: Networking & Data · flowchart

Flowchart14 objects

Software

Software · L2 · Terraform: Safe Applies with Remote State & Locking · flowchart

@openstem

Software · L2 · Terraform: Safe Applies with Remote State & Locking · flowchart

Flashcards10 cards

What does interactive rebase let you do?1 / 10

git rebase -i lets you reorder, edit, squash, fixup, or drop commits within a range, rewriting that part of history before sharing it.

Software

Rebase & Rewriting History

@openstem

Rebase & Rewriting History

Quiz6 questions

What distinguishes the π-calculus from CSP in terms of expressive power?

AThe π-calculus supports asynchronous shared-memory communication; CSP does notBThe π-calculus allows channel names to be communicated as data, enabling dynamic reconfiguration of communication topologyCCSP supports recursion while the π-calculus does notDThe π-calculus has no notion of internal choice

Software

Software · L5 · Process Calculi & Concurrency Theory

@openstem

Software · L5 · Process Calculi & Concurrency Theory

Flowchart7 objects

Software

Software · L2 · Spring Boot: Data Access & Transactions · flowchart

@openstem

Software · L2 · Spring Boot: Data Access & Transactions · flowchart

Quiz5 questions

What does `docker build` produce?

AA running containerBA local imageCA registry accountDA Dockerfile

Software

Software · L1 · Docker & Kubernetes: Image Build & Deploy Lifecycle

@openstem

Software · L1 · Docker & Kubernetes: Image Build & Deploy Lifecycle

Collection4 items

01Core & Dependency Injection

02Configuration & Properties

03Software · L1 · Spring Boot: Application Lifecycle & Logging

+1 more

Software

Software · L1 · Spring Boot

@openstem

Software · L1 · Spring Boot

Flashcards10 cards

What are the main phases of the browser rendering pipeline?1 / 10

Roughly: parse HTML/CSS into the DOM/CSSOM, build the render tree, compute layout (reflow), paint pixels, then composite layers onto the screen.

Software

Browser Rendering & Performance

@openstem

Browser Rendering & Performance

Flowchart15 objects

Software

Software · L3 · Regex or Real Parser?

@openstem

Software · L3 · Regex or Real Parser?

Flashcards10 cards

What is the RSC payload, and how does it differ from the HTML a route produces?1 / 10

The RSC payload is a compact serialized description of the Server Component tree — rendered element output plus placeholders for Client Components and their props. The server uses it to produce the initial HTML, then streams the same payload to the client so React can reconcile and hydrate the Client Component holes without re-running server logic.

Software

Rendering Architecture: RSC, Streaming & Caching

@openstem

Rendering Architecture: RSC, Streaming & Caching

Flowchart13 objects

Software

Software · L1 · Networking & HTTP: Anatomy of a Web Request · flowchart

@openstem

Software · L1 · Networking & HTTP: Anatomy of a Web Request · flowchart

Quiz5 questions

Why work on a separate feature branch instead of committing directly to main?

AFeature branches are required by Git itselfBIt keeps main always deployable and gives reviewers a clean diffCIt makes commits smaller automaticallyDIt disables CI on the branch

Software

Software · L1 · Git & Dev Workflow: The Feature Branch Workflow

@openstem

Software · L1 · Git & Dev Workflow: The Feature Branch Workflow

Note~507 words · 3 min

Schema-First Thinking A GraphQL API is defined by a strongly typed schema written in the Schema Definition Language (SDL): object types, scalars, enums, interfaces, and the three root operation types. The schema is a contract — clients can

Software

Software · L3 · GraphQL API Design

@openstem

Software · L3 · GraphQL API Design

Collection2 items

01Dart VM, Isolates & Async Internals

02Type System, Null Safety & Compilation

Software

Software · L4 · Dart

@openstem

Software · L4 · Dart

Flashcards10 cards

What is the difference between SSR, SSG, and ISR in Next.js?1 / 10

SSR (Server-Side Rendering) renders HTML per request. SSG (Static Site Generation) renders at build time, serving static HTML. ISR (Incremental Static Regeneration) serves static pages but regenerates them in the background after a revalidation interval — combining SSG speed with fresh data.

Software

Rendering & Routing

@openstem

Rendering & Routing

‹ PrevPage 18 of 25Next ›