Technology interview questions hub
Angular Interview Questions for Frontend Interviews
Use this Angular interview questions hub to practice coding and trivia leaves, then return to the master library and interview practice platform.
Practice snapshot
Focus by stack, not random tabs.
This hub keeps coding and trivia in one flow so implementation and explanation skills improve together.
Angular
Use this page as a planning surface for interview prep, not just a random question feed.
- Prioritize high-impact angular coding prompts first.
- Use angular trivia rounds to sharpen explanation speed.
- Escalate into the frontend interview prep platform for guided sequencing.
Coding challenges to start with
- Angular Chessboard Click/Highlight (N×N Board)
Build an interactive N×N chessboard in Angular. Clicking a cell should highlight it and clear the previous selection. Add a size control so users can change board dimensions.
Open challenge → - Angular Progress Bar (0–100 with Threshold Colors)
Build an Angular progress bar for values 0–100 with +10/−10 controls. Clamp the value, show the percentage, and change the fill color based on thresholds (red/orange/green) to reflect status and urgency. Concepts: compo…
Open challenge → - Counter (Standalone Component)
Implement a standalone counter with increment, decrement, and reset. Guard the decrement at zero, disable the minus button when the value is 0, and keep state in a single component property for predictable behavior.
Open challenge → - Like Button (Facebook-style Toggle)
Create a Like button with toggle state and a counter in Angular. Clicking should increment on like, decrement on unlike, and never allow the count to drop below zero. The template should reflect state immediately and ap…
Open challenge → - Tic-Tac-Toe (Standalone Component)
Build a 3x3 Tic-Tac-Toe game in an Angular standalone component. Alternate X/O turns, prevent overwrites, detect wins and draws, and offer a reset to start a new game. Concepts: components, state, event-binding.
Open challenge → - Todo List (Standalone Component with ngFor)
Build a small todo list using an Angular standalone component. Allow users to add tasks, mark them as completed, and remove them. Use `*ngFor` to render the list and simple component state to drive the UI.
Open challenge → - Angular Accordion / FAQ Component
Build a simple FAQ (accordion) component in Angular using inputs/outputs. Clicking a question should toggle its answer. By default, only one item can be open at a time, but the user can enable a mode where multiple item…
Open challenge → - Angular Dynamic Counter Buttons (Grow-on-Click)
In Angular, users should be able to add or remove step buttons dynamically, and each button should update the counter by its own step value. Concepts: components, event binding, state, ng for, arrays. Angular focus: sto…
Open challenge → - Angular Paginated Data Table
Build a simple paginated data table in Angular that shows a static list of users. Display 5 rows per page, with Previous / Next controls and a "Page X of Y" indicator. Disable the navigation buttons appropriately on the…
Open challenge → - Image Slider (Standalone Component)
Build an image slider with next/prev controls, a current index, and disabled states at bounds. Keep the template state-driven and update the active slide label as the index changes. Concepts: components, event-binding,…
Open challenge → - Invite Chips Input (Tags + Autocomplete)
Build a Material-like invite field in Angular. As users type, show autocomplete suggestions, convert selections into removable chips, and support keyboard shortcuts (Enter/comma/backspace).
Open challenge → - Nested Checkbox Tree (Standalone Component)
Build a standalone Angular component that renders a parent checkbox with multiple child checkboxes. Toggling the parent should check/uncheck all children. Toggling children should update the parent to checked, unchecked…
Open challenge →
Trivia questions for explanation speed
- How does Angular compile templates and bind them to component state?
Angular turns your component template into generated render/update instructions (AOT or JIT). At runtime, change detection re-runs the update phase so bindings (text, properties, attributes, events) stay in sync with th…
Open question → - How does Angular event binding work (DOM events vs @Output events), and what are the common pitfalls?
Angular event binding uses the (event) syntax to listen to either native DOM events (click, input, submit, keydown, etc.) or custom events emitted by child components via @Output(). When the event fires, Angular runs th…
Open question → - NgRx data flow end-to-end in Angular: actions, reducers, effects, selectors
NgRx data flow in Angular follows a predictable loop: component dispatches actions, reducers create the next immutable state, selectors read and derive view data, and effects handle async side effects before dispatching…
Open question → - NgRx reducer pure function in practice: immutability, side effects, and common mistakes
A reducer in NgRx must be a pure function: same input state + action must always produce the same next state, with no side effects. Interviewers test reducer immutability and whether you can spot forbidden reducer side…
Open question → - NgRx selectors beyond getting state: memoization, derived state, and Angular performance
NgRx selectors are not just state getters. They create memoized, composable read models that power derived state in Angular apps. Interviewers expect you to explain selector composition, NgRx selector memoization behavi…
Open question → - NgRx Store vs local component state in Angular: global vs local, and when to use NgRx
One of the most practical Angular state management decisions is choosing NgRx Store vs local component state. Use local state for short-lived UI details and use Store for shared, long-lived, globally relevant state. Int…
Open question → - Observables in Angular: what they are, why RxJS matters, and how to use them correctly (async pipe, cancellation, operators)
In Angular, most async APIs expose RxJS Observables (HttpClient, form valueChanges, router events). An Observable is a lazy stream that can emit 0..N values over time and supports cancellation via unsubscribe. Interview…
Open question → - What metadata does @Component provide, and why does Angular need it?
The @Component decorator attaches metadata to a TypeScript class so Angular can treat it as a component. This metadata tells Angular how to render the view (template + styles), how to match it in HTML (selector), what d…
Open question → - What responsibilities belong inside an Angular component vs a service?
Angular components should focus on UI/presentation and user interactions, while services should hold reusable logic, business rules, and side effects (HTTP, caching, state). Clean separation keeps components thin, impro…
Open question → - Angular pipes: built-in, async pipe, and pure vs impure (performance + pitfalls)
Angular pipes transform values in templates using the | operator (formatting, slicing, mapping) without mutating the source. Most pipes are pure (run only when input reference/primitive changes). The async pipe is speci…
Open question → - How does *ngIf affect the DOM and component lifecycle?
*ngIf is a structural directive that conditionally creates and destroys an embedded view. That means DOM nodes, component instances, directives, listeners, and template bindings inside the *ngIf block are actually creat…
Open question → - How would you implement two-way binding for a custom component (Input/Output naming convention), and what can go wrong?
Custom two-way binding uses an @Input() value and a paired @Output() valueChange event. The binding syntax [(value)] listens to valueChange and updates value. Mismatched names or missing emitters break the binding. Cove…
Open question →
Complete the prep loop
After these Angular Interview Questions for Frontend Interviews drills, continue with frontend interview questions hub, then frontend interview preparation guides and frontend interview preparation tracks to keep your weekly plan structured.