CoffeeHouse: Interactive Membership Savings Calculator & ROI Slider Puzzle #27
A real-time interactive membership savings calculator built for CoffeeHouse. Features dynamic signature brew selection, a custom daily consumption range slider with animated thumb badge, precision mathematical telemetry (7% digital membership discount), developer studio controls, and an automated diagnostic test suite.
Crafted with Passion
Since 2010, we've been dedicated to bringing you the finest coffee experience. Every cup tells a story of dedication, quality, and the perfect roast.
Our beans are ethically sourced from farms around the world, and our baristas are trained to bring out the best in every blend.
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Get early access to seasonal blends, exclusive discounts, and behind-the-scenes updates
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Interactive ROI & Parameter Studio
Experiment with member discount percentages, currency symbols, and custom consumption profiles.
2 × 7 × ($5.50 × 0.07) = $5.39/wk
/* Vanilla JS Calculation Engine */
const DISCOUNT_RATE = 0.07; // 7% Member Discount
const WEEKS_PER_YEAR = 52;
function calculateSavings(price, cupsPerDay, discountRate = DISCOUNT_RATE) {
const memberPrice = price * (1 - discountRate);
const savePerCoffee = price * discountRate;
// Weekly formula: Daily cups × 7 days × unit savings
const weeklySavings = cupsPerDay * 7 * savePerCoffee;
// Yearly formula: Weekly savings × 52 weeks
const yearlySavings = weeklySavings * WEEKS_PER_YEAR;
return {
standardPrice: price.toFixed(2),
memberPrice: memberPrice.toFixed(2),
savePerCoffee: savePerCoffee.toFixed(2),
weeklySavings: weeklySavings.toFixed(2),
yearlySavings: yearlySavings.toFixed(2)
};
}In-Browser Diagnostic Test Suite
Automated verification of state propagation, range slider mechanics, tooltip tracking, arithmetic accuracy, and accessibility.