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Angular Dynamic Counter Buttons (Grow-on-Click)

By FrontendAtlas Team · Updated Jan 30, 2026

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: store step buttons in arrays and render with *ngFor. Framework…

Use a standalone Angular root component.
Initially render exactly 1 counter button with value 0.

What you’ll build / What this tests

This premium angular coding focuses on Angular Dynamic Counter Buttons (Grow-on-Click). You’ll apply components and event-binding thinking with medium level constraints. The prompt emphasizes In Angular, users should be able to add or remove step buttons dynamically, and each button….

Learning goals

Translate the prompt into a clear angular API signature and return shape.
Apply components, event-binding, state techniques to implement angular dynamic counter buttons (grow-on-click).
Handle medium 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.
Choose iteration vs higher-order methods for readability.
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 root component.
Initially render exactly 1 counter button with value 0.
Clicking any button increments ONLY that button’s value by 1.
After each click, append a NEW button at the bottom with value 0.
All buttons keep their own values independently.
Initial UI: one button showing 0.
Click first button once → first becomes 1, and a second button (0) appears below.
Click second button twice → second becomes 2, and two more new buttons (0, 0) are appended over…
Existing button values never reset when new buttons appear.
Store button values in an array like counts: number[].

Mini snippet (usage only)

// Example usage
const input = /* angular dynamic counter buttons (grow-on-click) 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.