Use an object as a fast lookup table for coupon discounts.
You start with:
const subtotal = 100;
const coupon = "SAVE20";
const coupons = {"SAVE10": 10, "SAVE20": 20, "SAVE50": 50};
Build:
Total: $80
Rules:
- Look up
couponincoupons. If it is there, its value is thediscount; if it is not (an unknown code), the discount is0. total = subtotal - discount.- Build the text
"Total: $<total>"(e.g."Total: $80"; an unknown coupon would give"Total: $100"). - Store it in
result, then print it withconsole.log(result).
coupons[coupon] is undefined when the key is missing. Use a ternary to default to 0.
In JavaScript
"Total: $" + total converts the number to text for you.
const subtotal = 100;
const coupon = "SAVE20";
const coupons = {"SAVE10": 10, "SAVE20": 20, "SAVE50": 50};
const discount = coupons[coupon] !== undefined ? coupons[coupon] : 0;
const total = subtotal - discount;
const result = "Total: $" + total;
console.log(result);
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