How wikode/calculatrice-javascript works
1. Project type
- This is a small client-side calculator built for learning DOM manipulation in JavaScript.
- It is not backed by a server, database, or API; the whole app runs in the browser.
2. Core runtime
- The execution environment is the browser.
- JavaScript provides all interaction and calculation logic, while HTML and CSS provide structure and presentation.
3. UI structure
- index.html is the entry point and defines the calculator’s visible layout.
- It likely contains the display area plus the button grid for digits and operators, with no routing or multi-page navigation.
4. Styling layer
- style.css is the complete visual subsystem.
- It controls layout, sizing, colors, spacing, and the calculator’s look-and-feel, separate from the behavior code.
5. Interaction and logic
- app.js is the application logic layer.
- It handles button clicks, updates the display, and performs arithmetic operations, acting as the bridge between the DOM and calculator state.
6. Data flow
- User input starts in the browser through button presses.
- Events are captured in JavaScript, translated into calculator state changes, and reflected back into the DOM display.
- The primary output is the updated on-screen result, not persisted data.
7. State model
- The calculator state is likely kept entirely in memory in app.js.
- Typical state elements for this kind of app are the current value, selected operator, and pending result, with no storage beyond the current session.
8. Boundaries
- There is a clear separation between markup (index.html), behavior (app.js), and presentation (style.css).
- No subsystem communicates with external services, making the architecture self-contained and deterministic.
9. Deployment
- The README points to GitHub Pages, so the app is intended for static hosting.
- Deployment is therefore just serving the static assets; no build pipeline is evident from the file tree.
10. Supporting files
- .vscode contains editor configuration for development convenience.
- .gitattributes likely manages line endings or repository text handling; it does not affect runtime architecture.
11. Architecture summary
- At a high level, this is a three-file static front-end app: HTML shell, CSS skin, and JavaScript controller/engine.
- The main diagram should show a browser user interacting with the DOM, with app.js mediating state and calculation logic entirely on the client side.
Main entry points: index.html HTML shell · app.js App logic · style.css Stylesheet
Components 8
Client app
Static browser-based calculator UI and logic
- Browser · Executes the app entirely on the client
- HTML shell · Defines the calculator layout and interactive elements
index.html - Stylesheet · Controls layout, spacing, colors, and visual presentation
style.css - App logic · Handles events, state updates, and calculations
app.js - Calculator DOM · Display and button grid rendered in the page
- Calc state · Holds current value, operator, and pending result during a session
- Arithmetic · Performs the calculator operations
Other components
- User · Presses calculator buttons and reads results
Connections 10
- User → Browser: interacts with · User presses buttons and views results
- Browser → HTML shell: loads · The static page is opened in the browser
- HTML shell → Calculator DOM: renders · HTML provides the display and keypad structure
- HTML shell → Stylesheet: styled by · Presentation is applied through CSS
- HTML shell → App logic: executes · JavaScript is loaded to wire up interactions
- App logic → Calculator DOM: updates · Changes the display and button-driven interface
- App logic → Calc state: reads/writes · Maintains calculator state in memory
- App logic → Arithmetic: invokes · Calls arithmetic logic for operations
- Calc state → Arithmetic: drives · Stored values feed each computation
- Arithmetic → Calculator DOM: outputs · Results are reflected back onto the display