For-in
The common for loop syntax for (i = a; i < b; i++) does not exist in Swift. Instead, for-in can be modified to have an index using tuples and enumerated:
Simple for-in
let birds = ["Owl", "Crane"]
for bird in birds {
print(bird)
}
// Output:
// Owl
// Crane
For-in with index
let birds = ["Owl", "Crane"]
for (i, bird) in birds.enumerated() {
print("[\(i)]: \(bird)")
}
// Output:
// [0]: Owl
// [1]: Crane
For-in-where
struct Player { let name: String, level: Int }
let players = [
Player(name: "Rashida", level: 1),
Player(name: "Tomoko", level: 1),
Player(name: "Isabella", level: 20)
]
for player in players where player.level == 1 {
print("\(player.name) is a beginner.")
}
// Output:
// Rashida is a beginner.
// Tomoko is a beginner.
Traditional for loop
It is still possible to create a for loop similar to for (i = a; i < b; i++):
let birds = ["Owl", "Crane"]
for i in 0 ..< birds.count {
print("[\(i)]: \(birds[i])")
}
// Output:
// [0]: Owl
// [1]: Crane
