Boolean

1. Khai báo Bool

let isSwiftFun: Bool = true
let isPythonBetter: Bool = false

var isValid = true
var isEmpty = false

2. Bool từ so sánh

let age = 25
let isAdult = age >= 18  // true

let score = 85
let isPassed = score >= 50  // true

3. Logical Operators

let a = true
let b = false

print(a && b)   // false - AND
print(a || b)   // true  - OR
print(!a)       // false - NOT

4. Bool trong conditions

let isWeekend = true

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

let status = isWeekend ? "Weekend" : "Weekday"

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📝 Tóm tắt

• Bool - true hoặc false
• &&, ||, ! - Logical operators
• Short-circuit evaluation