Vòng lặp for-in trong Swift

// Closed range
for i in 1...5 {
    print(i)  // 1, 2, 3, 4, 5
}
 
// Half-open range
for i in 1..<5 {
    print(i)  // 1, 2, 3, 4
}
 
// Stride (bước nhảy)
for i in stride(from: 0, to: 10, by: 2) {
    print(i)  // 0, 2, 4, 6, 8
}
 
// Descending
for i in stride(from: 10, through: 1, by: -1) {
    print(i)  // 10, 9, 8, ..., 1
}

let fruits = ["Apple", "Banana", "Orange"]
 
for fruit in fruits {
    print(fruit)
}
 
// Với index - enumerated()
for (index, fruit) in fruits.enumerated() {
    print("\(index): \(fruit)")
}

let scores = ["Alice": 95, "Bob": 87, "Charlie": 92]
 
for (name, score) in scores {
    print("\(name): \(score)")
}
 
// Chỉ keys
for name in scores.keys {
    print(name)
}
 
// Chỉ values
for score in scores.values {
    print(score)
}

let word = "Swift"
 
for char in word {
    print(char)  // S, w, i, f, t
}

// Lặp 3 lần, không dùng biến
for _ in 1...3 {
    print("Hello")
}

let numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
 
for num in numbers where num % 2 == 0 {
    print(num)  // 2, 4, 6, 8, 10
}