Three-item bundle validation — original JavaScript proof by Stephen TumblinThree-item bundle validation — original JavaScript proof by Stephen Tumblin

Three-item bundle validation — original JavaScript proof

Stephen Tumblin

Web Developer

JavaScript

E-Commerce

Three-item bundle selection logic

An original, independent JavaScript proof created with AI assistance and tested. It demonstrates a small part of a bundle-builder workflow; it is not client work or a deployed commerce integration.

Rules

Choose exactly three items across three placeholder flavors. Each quantity must be a whole number from zero to three. An unavailable flavor cannot have a positive quantity. A single-flavor option selects three units of one available flavor.

Small implementation excerpt

const LIMIT = 3;
const validCounts = counts.every((n, i) =>
  Number.isInteger(n) && n >= 0 && n <= LIMIT
  && (available[i] || n === 0));
const total = counts.reduce((sum, n) => sum + n, 0);
const ready = validCounts && total === LIMIT;

Tested behavior

All 64 quantity combinations from zero through three were checked. Exactly 10 sum to three and are accepted when stock is available. Additional checks cover unavailable stock, empty selection, fractional and negative quantities, and the single-flavor fallback. For example, [1,1,1] and [2,1,0] pass; [2,2,0] fails.

Integration boundary

The proof has no checkout or store connection. Browser UI, Replo, Shopify cart behavior and live inventory are not verified. A paid implementation needs its actual product IDs, stock rules, fallback meaning and cart behavior confirmed and tested before delivery.

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Posted Oct 7, 2026

Independent JavaScript selection logic: 64 quantity combinations checked, 10 valid bundles. No live store or integration claimed.

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