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Which keyword declares a block-scoped variable that cannot be reassigned?easyjavascript · singleWhat does `typeof null` return in JavaScript?easyjavascript · singleWhat is the result of `[] == false`?mediumjavascript · singleWhich method creates a new array with the results of calling a function on every element?mediumjavascript · singleWhat is printed? ```js console.log(typeof (() => {})); ```hardjavascript · singleWhich of the following are falsy values in JavaScript? (select all)easyjavascript · multiWhich array methods mutate the original array? (select all)mediumjavascript · multiWhich statements about Promises are correct? (select all)mediumjavascript · multiJavaScript's main execution model is single-threaded with an event loop.easyjavascript · boolean`==` and `===` always produce the same result for any pair of values.mediumjavascript · boolean`const` prevents mutation of object properties.easyjavascript · booleanWhat keyword is used to declare a function that always returns a Promise and allows `await` inside?easyjavascript · fillComplete: `JSON.____(obj)` converts a JavaScript value to a JSON string.mediumjavascript · fillAfter `let x;` runs with no initializer, what is the value of `x`? (one word)easyjavascript · fillOrder these from earliest to latest in the event loop:mediumjavascript · orderOrder the typical steps to handle a successful async fetch of JSON:easyjavascript · orderWhich snippet correctly checks if a value is a non-null object (not an array)?mediumjavascript · snippetWhich snippet correctly deep-clones a plain JSON-safe object (no functions/dates/maps)?easyjavascript · snippetMatch each array method to what it returns.easyjavascript · matchMatch each operator / construct to its primary use.mediumjavascript · matchClick the line that throws at runtime.mediumjavascript · hotspotClick the line that causes a Temporal Dead Zone ReferenceError.hardjavascript · hotspotWhat is logged?easyjavascript · outputWhat is logged?mediumjavascript · outputWhat is logged?hardjavascript · outputWhat does `Array.isArray([])` return?easyjavascript · singleWhat is the difference between `null` and `undefined`?mediumjavascript · singleWhich create a new array without mutating the original? (select all)mediumjavascript · multiTemplate literals use backticks and can embed expressions with `${...}`.easyjavascript · booleanWhat is logged?mediumjavascript · outputWhat is logged (three values, space-separated)?easyjavascript · outputWhat is logged?mediumjavascript · outputOrder these from earliest to latest in the event loop:mediumjavascript · orderClick the line that throws at runtime.easyjavascript · hotspotWhat is logged?mediumjavascript · outputOrder the logged labels from earliest to latest. ```js console.log("S"); Promise.resolve() .then(() => { console.log("M1"); return Promise.resolve(); }) .then(() => console.log("M2")); setTimeout(() => console.log("T"), 0); ```hardjavascript · orderClick the line that causes a Temporal Dead Zone ReferenceError.mediumjavascript · hotspotWhat is logged (three values, space-separated)?hardjavascript · outputClick the line that mutates the original `nums` array.mediumjavascript · hotspotOrder the typical steps to handle a successful async fetch of JSON:easyjavascript · orderOrder the logged labels from earliest to latest. ```js console.log("1"); setTimeout(() => console.log("2"), 0); queueMicrotask(() => console.log("3")); Promise.resolve().then(() => console.log("4")); console.log("5"); ```mediumjavascript · orderOrder the logged labels from earliest to latest. ```js console.log("A"); setTimeout(() => console.log("B"), 0); Promise.resolve() .then(() => { console.log("C"); setTimeout(() => console.log("D"), 0); return Promise.resolve(); }) .then(() => { console.log("E"); }); console.log("F"); ```hardjavascript · orderOrder the logged labels from earliest to latest. ```js setTimeout(() => console.log("T1"), 0); Promise.resolve().then(() => { console.log("P1"); setTimeout(() => console.log("T2"), 0); Promise.resolve().then(() => console.log("P2")); }); console.log("S"); ```hardjavascript · orderClick the line that throws at runtime.easyjavascript · hotspotClick the line that throws at runtime.mediumjavascript · hotspotClick the line that throws at runtime.mediumjavascript · hotspotClick the line that is invalid (await outside an async function).mediumjavascript · hotspotClick the line that throws at runtime.hardjavascript · hotspotWhat does TypeScript primarily add on top of JavaScript?easytypescript · singleWhich annotation correctly types a string variable?easytypescript · singleWhat is the difference between `interface` and `type` aliases for object shapes?mediumtypescript · singleWhat does the `?` mean in `function f(x?: number)`?mediumtypescript · singleWhat is a discriminated union useful for?hardtypescript · singleWhich are valid TypeScript primitive type keywords? (select all)easytypescript · multiWhich utility types are built into TypeScript? (select all)mediumtypescript · multiWhich statements about `any` vs `unknown` are true? (select all)mediumtypescript · multiType annotations are erased when TypeScript is compiled to JavaScript.easytypescript · boolean`enum` values always exist only at compile time and never appear in the emitted JavaScript.mediumtypescript · booleanA variable typed as `string | null` can be passed where a plain `string` is required without narrowing.easytypescript · booleanWhat keyword defines a named object shape that can be implemented by a class?easytypescript · fillComplete the utility: `ReadonlyArray<string>` is roughly equivalent to `____ string[]` (modifier + type).mediumtypescript · fillWhat operator asserts a more specific type (use carefully): `value ____ HTMLElement`?mediumtypescript · fillOrder the steps of a typical TypeScript build pipeline:mediumtypescript · orderOrder these from most permissive to most precise typing of an unknown JSON field:hardtypescript · orderWhich snippet correctly types a function that returns a number?easytypescript · snippetWhich snippet correctly defines a readonly tuple of two numbers?mediumtypescript · snippetMatch each TypeScript concept to its meaning.easytypescript · matchMatch each utility type to its effect.mediumtypescript · matchClick the line that is a type error (strict mode).mediumtypescript · hotspotClick the line that incorrectly uses a type assertion in a way that hides a real mismatch risk.hardtypescript · hotspotAfter compilation, what runtime type does this have? ```ts const x: number = 42; console.log(typeof x); ```easytypescript · outputWhat is the **annotated** type of `v`? (write the alias name or the union)mediumtypescript · outputWhat does `satisfies` do (TS 4.9+)?hardtypescript · singleWhat does `Readonly<T>` do?easytypescript · singleWhat is a type guard?mediumtypescript · singleWhich are valid ways to express an optional property on an object type? (select all)mediumtypescript · multiGenerics let you write reusable functions/types that work with multiple types while preserving type info.easytypescript · booleanWhat operator extracts the property names of a type as a string union? `type Keys = ____ User;`mediumtypescript · fillClick the line that is a type error (excess property check).mediumtypescript · hotspotClick the line that is a type error under strict null checks.mediumtypescript · hotspotClick the line that is a type error (wrong generic constraint usage).hardtypescript · hotspotWhich snippet correctly narrows `value` to `string` before calling `.toUpperCase()`?mediumtypescript · snippetWhich utility correctly builds a type with only `id` and `email` from `User`?mediumtypescript · snippetOrder the typical steps to safely use an `unknown` JSON value:mediumtypescript · orderWhat is logged at runtime?mediumtypescript · outputWhat is the `never` type mainly used for?mediumtypescript · singleWhat does `Record<string, number>` describe?easytypescript · singleWhich widen or erase type information at compile time? (select all)mediumtypescript · multi`interface` declarations with the same name in the same scope merge their members.easytypescript · booleanComplete: `type NoName = ____<User, "name">` removes the `name` property from `User`.mediumtypescript · fillWhat is Tailwind CSS primarily?easytailwind · singleWhich class sets `display: flex`?easytailwind · singleWhat does `md:flex` mean?mediumtailwind · singleWhich pair correctly adds horizontal padding of 1rem (assuming default spacing scale)?mediumtailwind · singleIn Tailwind v4, how are styles commonly configured compared to classic v3 `tailwind.config.js`?hardtailwind · singleWhich classes affect text styling? (select all)easytailwind · multiWhich are valid state/variant prefixes in Tailwind? (select all)mediumtailwind · multiWhich utilities help with flex layout? (select all)mediumtailwind · multiTailwind is mobile-first: unprefixed utilities apply to all sizes, and `md:` styles apply from the md breakpoint up.easytailwind · booleanYou must write a custom CSS file for every button color; utilities cannot style background colors.mediumtailwind · boolean`hidden` sets `display: none`.easytailwind · booleanWhat class makes an element a CSS Grid container?easytailwind · fillWhat class sets `width: 100%`?mediumtailwind · fillComplete the class for medium screens and up: `____:text-lg` (breakpoint prefix only).mediumtailwind · fillA common authoring habit is layout → spacing → typography. Order these class groups that way (note: class order in HTML does not change utility CSS priority):mediumtailwind · orderOrder the responsive prefixes from smallest breakpoint to largest (default Tailwind screens):easytailwind · orderWhich markup correctly centers a flex child horizontally and vertically in a full-height box?easytailwind · snippetWhich snippet applies a hover background change correctly?mediumtailwind · snippetMatch each utility to its CSS effect.easytailwind · matchMatch each class to its purpose.mediumtailwind · matchClick the line with an invalid / non-standard Tailwind class for horizontal margin auto centering.mediumtailwind · hotspotClick the line where a conflicting pair likely fights for the same property (last in CSS generation wins, not source order of classes).hardtailwind · hotspotWhich CSS property does `font-bold` primarily set? (answer the property name)easytailwind · outputWhat CSS does `flex-1` roughly correspond to? Type the main declaration value or shorthand people associate (e.g. `1 1 0%` or `flex: 1`).mediumtailwind · outputWhat does the `group` / `group-hover:` pattern enable?hardtailwind · singleWhat does a React component typically return?easyreact · singleWhich hook holds state in a function component?easyreact · singleWhen does `useEffect(() => { ... }, [])` run?mediumreact · singleWhat is the correct way to update state based on the previous value?mediumreact · singleWhy are list keys important when rendering arrays?hardreact · singleWhich are valid React hooks? (select all)easyreact · multiWhich are Rules of Hooks? (select all)mediumreact · multiWhich props/patterns help pass data downward? (select all)mediumreact · multiReact state updates may be asynchronous / batched; reading state immediately after setState may show the old value.easyreact · booleanMutating state in place (e.g. `array.push` then `setArray(array)`) is the recommended way to update arrays.mediumreact · booleanJSX expressions go inside curly braces, e.g. `<h1>{title}</h1>`.easyreact · booleanWhat prop name passes a click handler to a button in React?easyreact · fillWhich hook returns a mutable ref object whose `.current` persists across renders without causing re-renders?mediumreact · fillComplete: `const [value, setValue] = ____(initial);`mediumreact · fillOrder a typical data-fetch effect lifecycle for a mounted component:mediumreact · orderOrder the basic steps to lift state up:easyreact · orderWhich snippet correctly renders a list of names?easyreact · snippetWhich snippet correctly cleans up a subscription in `useEffect`?mediumreact · snippetMatch each hook to its primary use.easyreact · matchMatch each term to its meaning.mediumreact · matchClick the line that violates the Rules of Hooks.mediumreact · hotspotClick the line that mutates state incorrectly.hardreact · hotspotAfter the first click, what count is shown? (type the number)easyreact · outputHow many times does `console.log` run on mount in React 18 Strict Mode (development)?mediumreact · outputWhat is the main purpose of React Context?hardreact · singleWhat is the correct way to pass a string prop in JSX?easyreact · singleWhen should you typically add a value to a `useEffect` dependency array?mediumreact · singleWhich are good reasons to extract a custom hook? (select all)mediumreact · multiIn React, props should be treated as read-only by the child component.easyreact · booleanWhich snippet correctly derives UI from state without storing redundant state?mediumreact · snippetWhat does HTML stand for?easyhtml · singleWhich element is the correct way to create a top-level page heading?easyhtml · singleWhich attribute provides alternative text for an image?mediumhtml · singleWhat is the difference between `<div>` and `<section>`?mediumhtml · singleWhich element associates a text label with a form control for accessibility?hardhtml · singleWhich are valid HTML5 semantic elements? (select all)easyhtml · multiWhich input types are valid in HTML5? (select all)mediumhtml · multiWhich attributes improve link/image accessibility or behavior? (select all)mediumhtml · multiThe `<title>` element belongs in the document `<head>`.easyhtml · booleanBlock-level elements like `<p>` may legally contain other `<p>` elements nested inside.mediumhtml · boolean`<img>` is a void (empty) element and does not use a closing tag.easyhtml · booleanWhat attribute on `<a>` specifies the destination URL?easyhtml · fillWhich element embeds a self-contained composition like a diagram with optional caption (`<figcaption>`)?mediumhtml · fillWhat is the root element of an HTML document?easyhtml · fillOrder these document skeleton pieces from outermost / earliest to innermost body content:easyhtml · orderOrder a typical accessible form field structure:mediumhtml · orderWhich snippet correctly links to an external stylesheet?easyhtml · snippetWhich snippet is the more accessible button for an action (not navigation)?mediumhtml · snippetMatch each element to its purpose.easyhtml · matchMatch each attribute to its role.mediumhtml · matchClick the line with an accessibility problem for the image.mediumhtml · hotspotClick the line that should use a semantic landmark instead of a generic container for primary navigation.hardhtml · hotspotWhat visible text does this produce? (type the text only)easyhtml · outputHow many list items will render?mediumhtml · outputWhat does the `defer` attribute on a `<script>` tag do?hardhtml · singleWhat does CSS stand for?easycss · singleWhich property changes text color?easycss · singleIn the box model, which area sits outside the border?mediumcss · singleWhat does `display: flex` primarily enable on a container?mediumcss · singleWhich selector has the highest specificity among these?hardcss · singleWhich are valid CSS length units? (select all)easycss · multiWhich properties participate in the standard CSS box model size of an element? (select all)mediumcss · multiWhich are valid ways to center a **block-level box** horizontally? (select all)mediumcss · multiClasses can be reused on many elements; IDs should be unique in a document.easycss · boolean`position: absolute` elements are always positioned relative to the viewport.mediumcss · booleanMedia queries can apply styles based on viewport width (e.g. `@media (min-width: 768px)`).easycss · booleanWhat property sets the space between an element's border and its content?easycss · fillComplete: `box-sizing: ____;` makes width/height include padding and border.mediumcss · fillWhat pseudo-class styles a link while the pointer is over it? (include the colon, e.g. `:name`)mediumcss · fillOrder these style origins from lowest to highest priority (simplified cascade):mediumcss · orderOrder these box-model layers from outermost to innermost:easycss · orderWhich snippet correctly selects all paragraphs inside elements with class `card`?easycss · snippetWhich snippet correctly creates a 3-column CSS Grid?mediumcss · snippetMatch each property to what it controls.easycss · matchMatch each Flexbox property to its role.mediumcss · matchClick the declaration that is invalid / will be ignored.mediumcss · hotspotClick the rule that fails to apply a class selector (typo / wrong combinator intent).hardcss · hotspotWhat color is the text? Answer with the color keyword.easycss · outputWith default `box-sizing: content-box`, what is the total width in px of this box? (number only)mediumcss · outputWhat is the main purpose of CSS custom properties (variables)?hardcss · singleWhat is Node.js primarily?easynodejs · singleWhich object provides the command-line arguments in a Node process?easynodejs · singleWhat does `require` load in CommonJS?mediumnodejs · singleWhich core module is used to create an HTTP server without Express?mediumnodejs · singleWhat is the Event Loop's role in Node?hardnodejs · singleWhich are Node.js core modules? (select all)easynodejs · multiWhich statements about `package.json` are true? (select all)mediumnodejs · multiWhich are appropriate for reading environment configuration? (select all)mediumnodejs · multiNode.js can run JavaScript on the server without a web browser.easynodejs · boolean`fs.readFileSync` is non-blocking and never stalls the event loop.mediumnodejs · boolean`npm install` reads package.json / lockfile to install dependencies.easynodejs · booleanWhat global object is used to exit the process with a status code, e.g. `____.exit(1)`?easynodejs · fillWhich core module joins path segments in a cross-platform way? (`const path = require('____')`)mediumnodejs · fillExpress (and many apps) use which HTTP method name for reading a resource by URL? (common REST verb)mediumnodejs · fillOrder the steps to handle a JSON POST body in a simple Express-style API:mediumnodejs · orderOrder a typical project bootstrap:easynodejs · orderWhich snippet correctly creates a minimal HTTP server that responds with Hello?easynodejs · snippetWhich snippet correctly reads a file asynchronously with promises?mediumnodejs · snippetMatch each module/API to its use.easynodejs · matchMatch each HTTP status code to a typical meaning.mediumnodejs · matchClick the line that blocks the event loop during a request handler.mediumnodejs · hotspotClick the line that leaks a secret if this file is committed to git.hardnodejs · hotspotWhat is logged?easynodejs · outputWhat is printed?mediumnodejs · outputWhat is middleware in Express?hardnodejs · singleWhich clause filters rows before grouping?easypostgresql · singleWhich clause sorts query results?easypostgresql · singleWhat does an INNER JOIN return?mediumpostgresql · singleWhat is the primary purpose of a primary key?mediumpostgresql · singleWhat is the main purpose of a standard (non-unique) index on a column used in WHERE clauses?mediumpostgresql · singleWhich operator performs case-insensitive pattern matching in PostgreSQL?mediumpostgresql · singleWhich statements about NULL are true? (select all)mediumpostgresql · multiWhich features can enforce relationships between tables? (select all)mediumpostgresql · multiWhich statements about JSONB operators are true? (select all)hardpostgresql · multi`LIMIT 10` restricts a query result to at most ten rows.easypostgresql · boolean`COUNT(column_name)` counts NULL values in that column.mediumpostgresql · booleanChanges made after BEGIN become permanent only when COMMIT succeeds.mediumpostgresql · booleanComplete the query to return only rows where `active` is true: `SELECT * FROM users ____ active = true;`easypostgresql · fillWhich command ends a transaction and keeps its changes? `____;`mediumpostgresql · fillAdd the clause that returns inserted columns: `INSERT INTO users (email) VALUES ('a@example.com') ____ id;`mediumpostgresql · fillOrder these common clauses in a SELECT query:mediumpostgresql · orderOrder a successful transaction that creates an account and a profile:mediumpostgresql · orderWhich query correctly returns the five newest posts?easypostgresql · snippetWhich query counts orders for each customer?hardpostgresql · snippetMatch each SQL term to its role.easypostgresql · matchMatch each aggregate expression to what it counts.mediumpostgresql · matchClick the line that correctly filters rows with no manager.mediumpostgresql · hotspotClick the line that extracts the JSONB `name` field as text.hardpostgresql · hotspotWhat value does this query return?easypostgresql · outputWhat value does this query return?mediumpostgresql · outputWhich datasource provider value configures Prisma for PostgreSQL?easyprisma · singleWhat does `@id` mark on a Prisma model field?easyprisma · singleWhich scalar type is appropriate for a required email address in a Prisma model?mediumprisma · singleWhen querying one user by its unique email, which Prisma Client method fits?mediumprisma · singleWhich option loads a post's related author with a Prisma query?mediumprisma · singleWhat is the main purpose of `prisma migrate dev` during development?hardprisma · singleWhich field declarations add constraints or defaults? (select all)mediumprisma · multiWhich statements about Prisma query options are true? (select all)mediumprisma · multiWhich statements about relations are true? (select all)hardprisma · multi`@unique` prevents two records from storing the same non-null value for that field.easyprisma · boolean`findMany` returns an array (not a single object), even when its `where` clause filters by a unique field.mediumprisma · boolean`prisma db push` is designed to create migration history files for each schema change.hardprisma · booleanComplete the field attribute that makes email unique: `email String @____`easyprisma · fillComplete the query option that filters active users: `prisma.user.findMany({ ____: { active: true } })`mediumprisma · fillWhich Client method inserts one record? `prisma.user.____({ data: { email: 'a@example.com' } })`mediumprisma · fillOrder the usual Prisma 7 steps after adding a model field that needs a tracked development migration:mediumprisma · orderOrder the parts of a Prisma Client update call:mediumprisma · orderWhich model correctly gives `User` an integer primary key and unique email?easyprisma · snippetWhich query returns published posts and includes each post's author?hardprisma · snippetMatch each Prisma Client method to its usual job.easyprisma · matchMatch each schema feature to its effect.mediumprisma · matchClick the line that declares the foreign key scalar for the Post-to-User relation.mediumprisma · hotspotClick the line that configures cascading deletes from a user to related posts.hardprisma · hotspotWhat number is logged?easyprisma · outputWhat number is logged?mediumprisma · outputWhich built-in type is immutable?easypython · singleWhich value means “no value” in Python?easypython · singleWhich expression compares whether two variables refer to the same object?mediumpython · singleWhich collection stores key-value pairs?easypython · singleWhat does `items[1:4]` return for a list?mediumpython · singleWhy is `def add(item, items=[]): ...` usually risky?mediumpython · singleWhat does `enumerate(names)` provide while looping?easypython · singleWhich call sorts users by their `age` key without changing the original list?mediumpython · singleWhich string method removes whitespace from both ends of a string?easypython · singleFor repeated membership checks in a large collection of unique values, which is usually the better fit?mediumpython · singleWhich values are falsy in Python? (select all)easypython · multiWhich statements about function parameters are true? (select all)mediumpython · multiWhich are common ways to handle an expected exception? (select all)mediumpython · multiWhich statements about imports are correct? (select all)mediumpython · multi`None == False` evaluates to `True` in Python.easypython · booleanA `with open(...) as file:` block closes the file when the block exits, even if an exception occurs.easypython · booleanLooking up a value by key in a dictionary is usually faster than scanning a list for a matching value.mediumpython · booleanComplete the f-string: `message = f"Hello, {____}!"`easypython · fillComplete: `for left, right in ____([1, 2], ['a', 'b']):`easypython · fillComplete the safe mutable-default pattern: `def add(item, items=____):`mediumpython · fillIn an instance method, the conventional first parameter is named `____`.easypython · fillOrder the usual steps for reading a text file safely:easypython · orderOrder these parts of a targeted exception flow:mediumpython · orderWhich snippet builds a list of squares for the even numbers in `numbers`?easypython · snippetWhich snippet correctly appends to a new list on every call when the caller leaves `items` out?mediumpython · snippetWhich snippet builds a dictionary counting each word in `words`?mediumpython · snippetMatch each collection to its main characteristic.easypython · matchMatch each tool to its usual loop use.mediumpython · matchClick the line that raises a `KeyError` when `user` has no `email` key.mediumpython · hotspotWhat does this print?mediumpython · outputWhat sits in front of multiple app instances to distribute incoming traffic?easyarchitecture · singleWhat is the main job of a reverse proxy in a typical web stack?easyarchitecture · singleA CDN caches responses closer to users to reduce latency and origin load.easyarchitecture · booleanOn a CDN cache miss, what does the origin server do?mediumarchitecture · singleIn a common production request path, what sits between the client and the app?mediumarchitecture · singleWhich are benefits of horizontal scaling? (select all)mediumarchitecture · multiWhat does vertical scaling usually mean?easyarchitecture · singleMatch each component to its primary role.mediumarchitecture · matchOrder these hops for a typical web request (first → last).mediumarchitecture · orderWhy cache responses near the edge (CDN/browser)?mediumarchitecture · singleSticky sessions are always required when using a load balancer.mediumarchitecture · booleanWhat do load-balancer health checks primarily enable?hardarchitecture · singleWhat is a primary tradeoff of a monolith versus many small services?mediumarchitecture · singleWhat does CDN stand for? (three words)mediumarchitecture · fillWhich problem is classically hardest about caching?hardarchitecture · singleWhich belong on a typical web request-path diagram? (select all)mediumarchitecture · multiWhen are retries of the same POST request safest?hardarchitecture · singleIn a standard deployment, a reverse proxy faces clients and forwards to app processes behind it.easyarchitecture · booleanWhere does Next.js middleware typically run in the request flow?easynextjs · singleWhat is a main benefit of React Server Components in the App Router?easynextjs · singleA file that uses useState must be a Client Component (typically with "use client").easynextjs · booleanWhat are Route Handlers primarily for in the App Router?mediumnextjs · singleWhat is special about environment variables prefixed with NEXT_PUBLIC_?mediumnextjs · singleWhich values should stay server-only (not NEXT_PUBLIC_)? (select all)mediumnextjs · multiMatch each Next.js piece to its role.mediumnextjs · matchOrder a typical App Router data path (first → last).mediumnextjs · orderIn Next.js caching discussions, what does revalidate generally control?mediumnextjs · singleEvery App Router page is always fully static at build time.mediumnextjs · booleanShipping a database password in NEXT_PUBLIC_DATABASE_URL is:hardnextjs · singleEdge middleware is usually the best place for which kind of work?mediumnextjs · singleWhat directive string marks a Client Component file? (two words, quoted form optional)easynextjs · fillWhere does a fetch inside a Server Component run?hardnextjs · singleWhich are plausible Next.js production deployment shapes? (select all)mediumnextjs · multiRoute Handlers can serve as a small HTTP API inside a Next.js app.easynextjs · booleanWhat does CI primarily focus on?easydevops · singleWhat does CD usually refer to in DevOps conversations?easydevops · singleContainers package an application with its dependencies for consistent runtime environments.easydevops · booleanOrder a simple CI/CD flow (first → last).mediumdevops · orderWhy put nginx/Caddy (or similar) in front of a Node app?mediumdevops · singleMatch each observability signal to what it usually answers.mediumdevops · matchWhat is the core idea of blue-green deployment?mediumdevops · singleA rolling deploy always updates every instance at the exact same instant.mediumdevops · booleanWhat is the purpose of a readiness probe?mediumdevops · singleWhich should live in env/secret config rather than committed source? (select all)mediumdevops · multiWhat is a risk if blue and green share one destructive migration path incorrectly?harddevops · singleA good build artifact should be:easydevops · singleServers you never SSH-mutate, replacing them with new images instead, are often called _____ infrastructure.mediumdevops · fillCompared to a VM, a container typically:mediumdevops · singleWhich traits make a good health check? (select all)harddevops · multiIn small setups, the app often listens on an internal port while a reverse proxy handles public HTTPS.easydevops · boolean

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