feat: enhance product availability logic and tests

- Introduced a `price` variable to determine discounts and updated the `hasDiscount` logic to check if the price is under 50.
- Updated the README to reflect the new task order and removed the `isOnSale` variable from the exercise.
- Adjusted test cases to verify the export of `hasDiscount` and its boolean type.
- Enhanced console logs for better clarity on product status.

Author: kentcdodds

exercises/03.primitive-types/03.problem.booleans-and-comparisons/README.mdx

@@ -26,11 +26,10 @@ const result3 = (a || b) && c // || happens first, then &&
 🐨 Open <InlineFile file="index.ts" /> and complete the following tasks:
 
 1. Create a variable `isAvailable` with type `boolean` set to `true`
-2. Create a variable `isOnSale` with type `boolean` set to `false`
-3. Create a variable `hasDiscount` that's `true` when the price is under 50
-4. Create a variable `canPurchase` that's `true` when the item is available AND
+2. Create a variable `hasDiscount` that's `true` when the price is under 50
+3. Create a variable `canPurchase` that's `true` when the item is available AND
    in stock
-5. Create a variable `isNotAvailable` that's the opposite of `isAvailable` using
+4. Create a variable `isNotAvailable` that's the opposite of `isAvailable` using
    the `!` operator
 
 📜 [MDN - Logical operators](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Expressions_and_Operators#logical_operators)

exercises/03.primitive-types/03.problem.booleans-and-comparisons/index.ts

@@ -1,6 +1,7 @@
 // Product Availability System
 // Using booleans to track product status
 
+const price: number = 29.99
 const stockCount: number = 100
 
 // 🐨 Create a variable `isAvailable` with type `boolean` set to `true`
@@ -25,4 +26,4 @@ console.log('Can Purchase:', canPurchase)
 console.log('Is Not Available:', isNotAvailable)
 
 // 🐨 Export your variables so we can verify your work
-// export { isAvailable, isOnSale, hasDiscount, canPurchase, isNotAvailable }
+// export { isAvailable, hasDiscount, canPurchase, isNotAvailable }

exercises/03.primitive-types/03.solution.booleans-and-comparisons/index.test.ts

@@ -22,10 +22,26 @@ await test('isAvailable should be true', () => {
 	)
 })
 
-await test('isOnSale is exported', () => {
+await test('hasDiscount is exported', () => {
 	assert.ok(
-		'isOnSale' in solution,
-		'🚨 Make sure you export "isOnSale" - add: export { isAvailable, isOnSale, ... }',
+		'hasDiscount' in solution,
+		'🚨 Make sure you export "hasDiscount" - add: export { isAvailable, hasDiscount, ... }',
+	)
+})
+
+await test('hasDiscount should be true (price < 50)', () => {
+	assert.strictEqual(
+		solution.hasDiscount,
+		true,
+		'🚨 hasDiscount should be true when price < 50 - use a comparison: price < 50',
+	)
+})
+
+await test('hasDiscount should be a boolean type', () => {
+	assert.strictEqual(
+		typeof solution.hasDiscount,
+		'boolean',
+		'🚨 hasDiscount should be a boolean type - use a comparison: price < 50',
 	)
 })
 

exercises/03.primitive-types/03.solution.booleans-and-comparisons/index.ts

@@ -1,17 +1,21 @@
 // Product Availability System
 // Using booleans to track product status
 
+const price: number = 29.99
 const stockCount: number = 100
 
 const isAvailable: boolean = true
 
+const hasDiscount: boolean = price < 50
+
 const canPurchase: boolean = isAvailable && stockCount > 0
 
 const isNotAvailable: boolean = !isAvailable
 
 // ✅ Verification
 console.log('Is Available:', isAvailable)
+console.log('Has Discount:', hasDiscount)
 console.log('Can Purchase:', canPurchase)
 console.log('Is Not Available:', isNotAvailable)
 
-export { isAvailable, canPurchase, isNotAvailable }
+export { isAvailable, hasDiscount, canPurchase, isNotAvailable }