Toán tử logic

1. AND Operator (&&)

let age = 25
let hasLicense = true

if age >= 18 && hasLicense {
    print("Can drive")
}

2. OR Operator (||)

let isWeekend = true
let isHoliday = false

if isWeekend || isHoliday {
    print("Day off!")
}

3. NOT Operator (!)

let isRaining = false

if !isRaining {
    print("Go outside")
}

4. Combining Operators

let age = 25
let hasLicense = true
let hasInsurance = false

if age >= 18 && hasLicense && !hasInsurance {
    print("Need insurance")
}

5. Short-circuit Evaluation

let result1 = false && expensiveCheck()  // Không gọi expensiveCheck()
let result2 = true || expensiveCheck()   // Không gọi expensiveCheck()

---

📝 Tóm tắt

• && - AND (cả hai true)
• || - OR (một trong hai true)
• ! - NOT (đảo ngược)
• Short-circuit evaluation
• Thứ tự: ! > && > ||