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Software: explore STEM content (page 24 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.

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Note~177 words · 1 min

Reading Big-O at a Glance Big-O describes how an algorithm's work grows as the input size n grows. Knowing the common classes by name makes it fast to reason about a new problem without re-deriving the math each time. Deciding How to Solve

Software

Software · L1 · Data Structures & Algos: Picking the Right Approach

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Software · L1 · Data Structures & Algos: Picking the Right Approach

Collection2 items

01TLS & Network Security

02API & Access Control

Software

Software · L3 · Security & Auth

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Software · L3 · Security & Auth

Flashcards10 cards

What does 'everything is a widget' mean in Flutter?1 / 10

The entire UI is built from widgets — not just buttons and text, but also layout (Row, Column, Padding), styling, and even the app itself. Widgets are immutable descriptions of part of the UI; Flutter builds a tree of them and renders it.

Software

Widgets & State

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Widgets & State

Quiz8 questions

When a backtracking regex engine fails to match after a greedy quantifier consumed input, what does it do?

AImmediately reports no match with no further attemptsBBacktracks, giving back characters one at a time and retrying the rest of the patternCRestarts the match from a random positionDSwitches to a lazy quantifier automatically

Software

Software · L3 · Regular Expressions & Text Parsing

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Software · L3 · Regular Expressions & Text Parsing

Collection4 items

01Streams & Buffers

02HTTP & Servers

03Software · L2 · Node.js: HTTP Middleware Pipeline

+1 more

Software

Software · L2 · Node.js

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Software · L2 · Node.js

Flashcards10 cards

What does `http.createServer(cb)` give you on each request?1 / 10

The callback receives an IncomingMessage (the readable request) and a ServerResponse (the writable response) for that connection.

Software

HTTP & Servers

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HTTP & Servers

Collection5 items

01OOP & Collections

02Generics & Exceptions

03Streams & Functional

+2 more

Software

Software · L2 · Java

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Software · L2 · Java

Collection9 items

01Software · L5 · Complexity Theory

02Software · L5 · Distributed Systems Theory

03Software · L5 · Type Theory and the λ-Calculus

+6 more

Software

Software · L5 · Theory & Distributed Systems

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Software · L5 · Theory & Distributed Systems

Flashcards10 cards

What is the difference between CommonJS and ES Modules?1 / 10

CommonJS (require/module.exports) is synchronous and was Node's original system. ES Modules (import/export) are the standard, support static analysis and tree-shaking, and are asynchronous. Node supports both; .mjs or "type":"module" enables ESM.

Software

Modules & Packages

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Modules & Packages

Collection2 items

01Browser Rendering & Performance

02CSS Architecture & Modern Selectors

Software

Software · L3 · HTML & CSS

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Software · L3 · HTML & CSS

Flashcards11 cards

What does `export const revalidate = 60` in a page do?1 / 11

It sets an Incremental Static Regeneration interval, so the cached page is regenerated at most once every 60 seconds when requested.

Software

Caching & Revalidation

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Caching & Revalidation

Collection4 items

01Core & Event Loop

02Modules & Packages

03Software · L1 · Node.js: Event Loop Walkthrough

+1 more

Software

Software · L1 · Node.js

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Software · L1 · Node.js

Flowchart11 objects

Software

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

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

Note~676 words · 3 min

Why Process Calculi Operational protocols like Paxos and Raft describe how a specific class of fault-tolerant systems reaches agreement. Process calculi sit one level up in abstraction: they are algebraic languages for describing and reason

Software

Software · L5 · Process Calculi: CSP, the π-Calculus, and Behavioural Equivalence

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Software · L5 · Process Calculi: CSP, the π-Calculus, and Behavioural Equivalence

Collection4 items

01Rendering & Reconciliation

02JSX & Components

03Software · L1 · React: The Render Cycle

+1 more

Software

Software · L1 · React

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Software · L1 · React

Quiz5 questions

What signals a producer to slow down when writing to a stream?

ABackpressure — write() returns false once the buffer hits highWaterMarkBThe 'end' eventCA thrown TypeErrorDNothing — Node buffers unboundedly

Software

Software · L2 · Node.js: Streams & HTTP Check

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Software · L2 · Node.js: Streams & HTTP Check

Flashcards10 cards

Precisely how does an isolate's event loop interleave the microtask and event queues?1 / 10

After each event-queue item completes, the loop drains the entire microtask queue — including microtasks scheduled while draining — before pulling the next event-queue item. Microtasks added during a microtask thus run before any timer or I/O event, so a runaway microtask producer can starve the event queue indefinitely.

Software

Dart VM, Isolates & Async Internals

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Dart VM, Isolates & Async Internals

Flashcards10 cards

How does the browser send cookies back to a server?1 / 10

After a server sets a cookie via Set-Cookie, the browser automatically attaches matching cookies in the Cookie header on subsequent requests to that domain/path, subject to Secure, SameSite, and expiry rules.

Software

Cookies, Sessions & Auth

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Cookies, Sessions & Auth

Collection4 items

01Software · L5 · Database Theory & Query Optimization

02Software · L5 · Database Theory: Relational Algebra, Serializability, and Query Optimization

03Software · L5 · From SQL Query to Physical Plan

+1 more

Software

Software · L5 · Database Theory & Query Optimization

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Software · L5 · Database Theory & Query Optimization

Collection2 items

01Runtime & Scheduler

02GC, Memory & Performance

Software

Software · L4 · Go

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Software · L4 · Go

Collection2 items

01Query Optimization & Execution Plans

02Transactions, Isolation & Concurrency

Software

Software · L4 · SQL

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Software · L4 · SQL

Flowchart11 objects

Software

Software · L2 · Networking & HTTP: OAuth 2.0 Authorization Code Flow · flowchart

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Software · L2 · Networking & HTTP: OAuth 2.0 Authorization Code Flow · flowchart

Flashcards5 cards

What is an algorithm?1 / 5

An algorithm is a list of steps you follow to finish a task. A recipe is a great example — it tells you exactly what to do.

Software

Software · L1 · Algorithms: Step-by-Step Instructions

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Software · L1 · Algorithms: Step-by-Step Instructions

Flashcards8 cards

What is a Kafka partition, and why does it determine ordering guarantees?1 / 8

A partition is an append-only, ordered log — one shard of a topic. Kafka guarantees order only within a single partition, not across a topic's partitions, so events that must stay ordered relative to each other (e.g. all updates to one entity) need to be produced with the same partition key so they land on the same partition.

Software

Event Streaming & Kafka

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Event Streaming & Kafka

Flashcards10 cards

What is the difference between a Docker image and a container?1 / 10

An image is an immutable, layered template (the blueprint). A container is a running (or stopped) instance of an image with its own writable layer. One image → many containers, like a class → objects.

Software

Docker

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Docker

Collection5 items

01Compute & Networking

02Storage & Databases

03IAM & Security

+2 more

Software

Software · L2 · Google Cloud

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Software · L2 · Google Cloud

Quiz5 questions

A function looks up a key that may or may not be in a HashMap. What's the idiomatic return type?

AResult<V, E>BOption<V>CV, and panic! if missingDbool

Software

Software · L2 · Rust: Option, Result, and panic!

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Software · L2 · Rust: Option, Result, and panic!

Flashcards10 cards

What does 'elasticity' mean in cloud computing?1 / 10

Elasticity is the ability to automatically scale resources up or down to match demand, so you provision capacity dynamically instead of buying for peak load.

Software

Cloud Fundamentals

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Cloud Fundamentals

Collection2 items

01IAM, Resource Hierarchy & Security

02Networking, Load Balancing & Reliability

Software

Software · L4 · Google Cloud

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Software · L4 · Google Cloud

Flashcards8 cards

What does an inode store?1 / 8

File metadata — type, permissions, owner, size, timestamps, and pointers to the data blocks — but not the file's name, which lives in directory entries.

Software

File Systems & I/O

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File Systems & I/O

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