Premium

Angular Progress Bar (0–100 with Threshold Colors)

By FrontendAtlas Team · Updated Jan 30, 2026

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: components, event binding, state, styling, derived state. Angular focus: use [ngStyle]/[ngClass] to map…

Use a standalone Angular component as the root component.
Render a progress bar where the fill represents a progress value from…

What you’ll build / What this tests

This premium angular coding focuses on Angular Progress Bar (0–100 with Threshold Colors). You’ll apply components and event-binding thinking with easy level constraints. The prompt emphasizes Build an Angular progress bar for values 0–100 with +10/−10 controls. Clamp the value, show the….

Learning goals

Translate the prompt into a clear angular API signature and return shape.
Apply components, event-binding, state techniques to implement angular progress bar (0–100 with threshold colors).
Handle easy edge cases without sacrificing readability.
Reason about time/space complexity and trade-offs in angular.

Key decisions to discuss

Define the exact input/output contract before coding.
Decide on concurrency and error propagation behavior.
Prioritize predictable edge-case handling over micro-optimizations.

Evaluation rubric

Correctness: covers required behaviors and edge cases.
Clarity: readable structure and predictable control flow.
Complexity: avoids unnecessary work for large inputs.
API discipline: no mutation of inputs; returns expected shape.
Testability: solution is easy to unit test.

Constraints / Requirements

Use a standalone Angular component as the root component.
Render a progress bar where the fill represents a progress value from 0 to 100.
Provide "-10%" and "+10%" buttons to decrease/increase progress by 10.
Clamp progress so it never goes below 0 or above 100.
Change the bar color based on thresholds (red/orange/green).
Display the current progress percentage (e.g., "40%").
Initial progress starts at 0%.
Clicking "+10%" increases progress by 10 up to 100.
Clicking "-10%" decreases progress by 10 down to 0.
Progress never renders below 0% or above 100%.

Mini snippet (usage only)

// Example usage
const input = /* angular progress bar (0–100 with threshold colors) input */;
const result = solve(input);
console.log(result);

// Edge case check
const empty = input ?? null;
const fallback = solve(input);
console.log(fallback);

// Expected: describe output shape, not the implementation
// (no solution code in preview)

Common pitfalls

Mutating inputs instead of returning a new value.
Skipping edge cases like empty input, duplicates, or nulls.
Overlooking time complexity for large inputs.