06-shipping-calculator.js

JavaScript
1/**
2 * 📦 ShopSwift Shipping Calculator
3 *
4 * ShopSwift is a growing online store. They've hired you to build their
5 * shipping cost calculator. The cost depends on the package weight,
6 * where it's going, and the order total.
7 *
8 * Domestic Shipping (country === "US"):
9 *   - Weight up to 1 kg:   $5
10 *   - Weight up to 5 kg:   $10
11 *   - Weight over 5 kg:    $15
12 *
13 * International Shipping (any other country):
14 *   - Weight up to 1 kg:   $15
15 *   - Weight up to 5 kg:   $25
16 *   - Weight over 5 kg:    $40
17 *
18 * Free Shipping:
19 *   - Domestic orders over $50 get FREE shipping (return 0)
20 *   - International orders over $100 get FREE shipping (return 0)
21 *
22 * Rules:
23 *   - If weight is 0 or negative, return -1
24 *   - If orderTotal is negative, return -1
25 *
26 * @param {number} weight - Package weight in kilograms
27 * @param {string} country - Destination country code (e.g., "US", "UK", "IN")
28 * @param {number} orderTotal - Total order amount in dollars
29 * @returns {number} Shipping cost, 0 for free shipping, or -1 for invalid input
30 */
31export function calculateShipping(weight, country, orderTotal) {
32  if (weight <= 0) {
33    return -1
34  }
35  if (orderTotal < 0) {
36    return -1
37  }
38
39  let shippingCost
40  if (country == "US") {
41    if (weight <= 1) {
42     shippingCost = 5
43    } else if (weight <= 5) {
44     shippingCost = 10
45    } else {
46     shippingCost = 15
47    }
48  } else {
49    if (weight <= 1) {
50     shippingCost = 15
51    } else if (weight <= 5) {
52     shippingCost = 25
53    } else {
54     shippingCost = 40
55    }
56  }
57
58  if (country == "US" && orderTotal > 50) {
59    return 0
60  }
61  if (country !== "US" && orderTotal > 100) {
62    return 0
63  }
64
65  return shippingCost
66}
67