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Vue Dynamic Counter Buttons (Grow-on-Click)

By FrontendAtlas Team · Updated Jan 30, 2026

In Vue 3, users should be able to add or remove step buttons dynamically, and each button should update the counter by its own step value. Concepts: vue, components, reactivity, event handlers, lists. Vue focus: store step buttons in reactive arrays and update with v-for.…

Render the dynamic counter buttons UI as the main component.
Initially render exactly 1 counter button with value 0.

What you’ll build / What this tests

This premium vue coding focuses on Vue Dynamic Counter Buttons (Grow-on-Click). You’ll apply vue and components thinking with medium level constraints. The prompt emphasizes In Vue 3, users should be able to add or remove step buttons dynamically, and each….

Learning goals

Translate the prompt into a clear vue API signature and return shape.
Apply vue, components, reactivity techniques to implement vue dynamic counter buttons (grow-on-click).
Handle medium edge cases without sacrificing readability.
Reason about time/space complexity and trade-offs in vue.

Key decisions to discuss

Define the exact input/output contract before coding.
Choose iteration vs higher-order methods for readability.
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

Render the dynamic counter buttons UI as the main 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.
Use Vue 3 Composition API with ref ([0]) to store the counts array.

Mini snippet (usage only)

// Example usage
const input = /* vue 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.